Genotype of the unknown parent is Tt.
What is the law of dominance in genetics, and how does it apply to the inheritance of traits?
The law of dominance states that when two different alleles for a trait are present in an individual, only the dominant allele will be expressed.
This applies to the inheritance of traits in organisms, where the dominant allele masks the expression of the recessive allele.
What is meant by the term genotype, and how does it differ from phenotype?Genotype refers to the genetic makeup of an individual, which includes the combination of alleles that determine a particular trait.
Phenotype, on the other hand, refers to the observable physical or behavioral characteristics of an organism that result from the interaction between its genotype and its environment.
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Why isn’t erosión affecting the height of Mt. Everest and making it shrink?
Answer: Scientists say Everest is getting taller, over time, because of plate tectonics. As the Indian plate slips under the Eurasian plate, it uplifts the Himalayas. But earthquakes can reduce their height in an instant.
Explanation:
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what specific processes occurred in the bacteria that took up the plasmid? be sure to include the enzymes and/or organelles involved, and how their stepwise actions resulted in the phenotype of the transformed bacteria.
The bacterial transformation process results in the phenotype of the transformed bacteria, which is determined by the genes carried by the plasmid DNA.
The bacterial transformation process involves the uptake of a plasmid by a bacterial cell, which results in the expression of new genes in the recipient bacterial cell. The transformed bacteria display new traits resulting from the uptake of the plasmid. The specific processes that occur in the bacteria that take up the plasmid include:1. Uptake of the plasmid by the bacterial cell2.
Integration of the plasmid DNA into the bacterial genome3. Expression of the new genes carried by the plasmid4. Production of the protein encoded by the new genes by the bacterial cell enzymes and organelles involved in the bacterial transformation process include:1. Restriction enzymes: Restriction enzymes are used to cut the plasmid DNA at specific sites, which makes it possible to insert new DNA fragments into the plasmid.2. Ligases: Ligases are used to seal the gaps between the plasmid DNA and the new DNA fragments.3. Competent cells: Competent cells are bacteria that can take up foreign DNA from the environment.
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A model of two structures that perform cellular processes is shown.
What are the products of the cellular processes in these organelles?
A.I: glucose and carbon dioxide
II: oxygen and water
B.I: carbon dioxide and oxygen
II: glucose and water
C.I: oxygen and glucose
II: water and carbon dioxide
Answer:
I: oxygen and glucose, II: water and carbon dioxide
Explanation: I got the answer wrong and this is what it said the right answer was.
The product of the cellular processes in these organelles are C. I: oxygen and glucose and II: water and carbon dioxide.
What are cellular processes?Cellular processes refer to the various biochemical and physiological activities that occur within a living cell to maintain its structure, function, and viability. These processes are essential for carrying out the basic functions of life, including energy production, DNA replication, protein synthesis, and cell division.
Cellular processes involve complex networks of biochemical reactions and signaling pathways, which are regulated by various enzymes, proteins, and other molecules. Some of the key cellular processes include metabolism, signaling, gene expression, cell cycle regulation, and apoptosis (programmed cell death).
These processes are tightly regulated and coordinated to ensure that cells function properly and respond appropriately to changes in their environment. Defects in cellular processes can lead to a wide range of diseases and disorders, such as cancer, diabetes, and neurodegenerative diseases.
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which term depicts species as a group of individuals capable of fertile interbreeding but reproductively isolated from one another?
The term which depicts species as a group of individuals capable of fertile interbreeding but reproductively isolated from one another is called biological species concept.
Species is the lowest level in the hierarchy of classification. The organisms belonging to the same species have almost similar type of characteristics and requirements. The most essential factor for organisms to be in the same species is reproducing compatibility.
Reproducibility is the property that differentiates the biotic factors from the abiotic ones. Reproduction is the mating between tow organisms to give rise to offspring. If an organism can reproduce and produce fertile offspring, it is said to be biotic.
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can you make a prediction about the rflp patterns of identical twins cut with the same restriction enzymes? how about the rflp patterns of fraternal twins or triplets?
When considering identical twins cut with the same restriction enzymes, we can make a prediction about the RFLP patterns. They will have the same RFLP patterns because they have identical DNA.
However, when considering fraternal twins or triplets, we cannot make a prediction about the RFLP patterns. They will have different RFLP patterns because they have different DNA.RFLP (Restriction Fragment Length Polymorphism) analysis is used in forensic science to compare DNA samples from crime scenes with those of suspects.
RFLP analysis is based on the presence of variations in the length of DNA fragments that are produced by restriction enzymes when they cut DNA samples. Different people have different DNA sequences, which results in different lengths of DNA fragments after restriction enzyme digestion.
RFLP patterns can be used to determine whether or not a DNA sample is related to a particular individual. Identical twins have the same DNA sequences, so they have the same RFLP patterns. Fraternal twins, on the other hand, have different DNA sequences, so they have different RFLP patterns.
Triplets also have different DNA sequences and thus different RFLP patterns. Therefore, the RFLP patterns of identical twins cut with the same restriction enzymes will be identical, while those of fraternal twins or triplets will differ.
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in response to infection with hepatitis b virus, hepatocytes bind the interferon they secrete. is this an example of paracrine or autocrine signaling
Yes, this is an example of autocrine signaling.
In autocrine signalling, a cell secretes a signalling chemical that interacts with receptors on its own cell surface to trigger a reaction within that particular cell. This implies that the cell that responds to the signalling molecule is also the one that secretes it.
Many physiological functions, including the control of cell division and proliferation, immunological responses, and wound healing, depend on autocrine signalling. Autocrine signalling may occasionally contribute to the onset of conditions like cancer, in which tumour cells may secrete growth factors that promote their own survival and proliferation.
In autocrine signalling, a cell secretes a signalling chemical that interacts with receptors on its own cell surface to trigger a reaction within that particular cell. Hepatocytes in this instance secrete interferon, which they later bind to.
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2) how long does it take for the immune system to provide protection by producing disease-specific antibodies and memory cells? imminization
It takes around three weeks for the immune system to provide protection by producing disease-specific antibodies and memory cells.
The vulnerable system is the body's defence medium, defending us from raiders similar as origins and contagions. Cells are the abecedarian structure units of our bodies. Our vulnerable system is made up of numerous distinct types of cells, each of which plays a vital part.
Numerous of them, particularly white blood cells, which are the crucial element of the mortal vulnerable system, may be set up in our rotation. White blood cells are set up strategically throughout the body, including the lymph bumps, spleen, lungs, bowel, and skin. This enables them to manage with infections no matter where they enter the body.
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3. Explain which processes take place
during meiosis that lead to variation in
inherited traits.
pleaseeee help
Answer: During melosis variation in inherited traits each parent chromosome pair along their lengths. The chromosomes cross over at points called chiasma.
which process does not display solute specificity? select an answer and submit. for keyboard navigation, use the up/down arrow keys to select an answer. a reabsorption along the distal tubule b reabsorption along the proximal tubule c filtration in the glomerulus d secretion along the distal tubule
The process which does not display solute specificity is Filtration in the glomerulus.
The correct answer is option c.
Filtration is the process in which fluid is separated from a solid mixture through a filter. In the body, filtration occurs in the glomerulus of the kidney, where blood is filtered and waste products are removed.
During filtration, solutes are separated from the blood and enter the filtrate, but this process does not display solute specificity. This means that all solutes, regardless of their chemical composition, are filtered out of the blood and enter the filtrate.
Thus, option c) is the correct answer.
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What type of heat transfer occurs in fluids?
O conduction
O insulation
O convection
what is achieved by two molecules of atp being consumed during the energy investment phase of glycolysis where atp reacts first with glucose and then with fructose 6 phosphate
During the energy investment phase of glycolysis, two molecules of ATP are consumed to achieve: the phosphorylation of glucose to glucose-6-phosphate and then to fructose-6-phosphate, ultimately producing fructose-1,6-bisphosphate.
Here is a step-by-step explanation:
1. ATP reacts with glucose, transferring a phosphate group to it, forming glucose-6-phosphate. This process is catalyzed by the enzyme hexokinase.
2. Glucose-6-phosphate is then converted to fructose-6-phosphate by the enzyme phosphoglucose isomerase.
3. Another ATP molecule reacts with fructose-6-phosphate, transferring a second phosphate group to it, forming fructose-1,6-bisphosphate. This reaction is catalyzed by the enzyme phosphofructokinase.
By consuming two ATP molecules during the energy investment phase, the glycolysis process primes the glucose molecule for subsequent breakdown and energy release in later stages.
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Help in this pls giving 30 points
4) iv)
Two characteristics of mammals are that they are warm-blooded (endothermic) and have hair or fur on their bodies.
The function of molars in mammals is to grind and crush food, aiding in the mechanical breakdown of food before swallowing and digestion.
What is fermentation?Fermentation is a metabolic process in which microorganisms such as yeast and bacteria convert sugars or carbohydrates into alcohol, gases, or acids, under anaerobic conditions.
i) One structural difference between yeast and bacterial cells is that yeast cells contain a nucleus and other membrane-bound organelles, while bacterial cells do not.
ii) Micro-organisms digest the fruit components before fermentation to break down complex molecules like polysaccharides into simpler ones such as glucose, which can then be used by the microorganisms for energy during fermentation.
iii) The products of fermentation by yeast include ethanol and carbon dioxide gas.
iv) The decrease in pH during fermentation is due to the production of acidic compounds like lactic acid and acetic acid by the microorganisms. Keeping the pH constant helps to maintain optimal conditions for the growth and activity of the microorganisms, leading to maximum fermentation.
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true or false: a twitch is a sustained contraction in a whole muscle that occurs when a threshold level stimulus is reached
When a stimulus reaches a threshold level, a twitch is a sustained contraction of the entire muscle. Tetany is a prolonged contraction. The correct answer is false.
A muscle twitch is an uncontrollable contraction of the muscle's fibers. Nerves control muscle filaments. A twitch occurs when a stimulus damage or stimulates a nerve. This causes the muscle fibers to contract. These twitches beneath the skin are frequently visible or perceptible.
Actin and myosin form cross-bridges during the contraction phase. As the sarcomere shortens and the muscle contracts, myosin moves actin, releases cross-bridges and reforms them multiple times. During this phase, ATP is used, and energy is released as heat.
A motor neuron's single action potential will cause the muscle fibers of its motor unit to contract once. A twitch is a name given to this isolated contraction.
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which phylogenetic tree can best be used to show that the zygomycetes and chytrids are the most closely related
A phylogenetic tree based on DNA sequence data can best be used to show that Zygomycetes and Chytrids are most closely related. Here option B is the correct answer.
This is because DNA sequence data provides the most accurate and reliable information about the evolutionary relationships between different organisms. By comparing the DNA sequences of different species, scientists can identify similarities and differences that reflect their evolutionary history.
In the case of the Zygomycetes and Chytrids, DNA sequence data has revealed that they share many similarities in their genetic makeup, indicating that they are more closely related to each other than to other fungal groups. A phylogenetic tree based on DNA sequence data would therefore be the best way to represent this relationship.
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Complete question:
Which phylogenetic tree can best be used to show that the Zygomycetes and Chytrids are the most closely related?
A) A phylogenetic tree based on morphology
B) A phylogenetic tree based on DNA sequence data
C) A phylogenetic tree based on the geographic distribution
D) A phylogenetic tree based on reproductive strategies
assuming no gene linkage in a dihybrid cross of aabb x aabb with aabb f1 heterozygotes, what is the ratio of the f1 gametes
If there is no gene linkage, the ratio of F1 gametes (AB, aB, Ab, ab) that will produce F2 offspring in a dihybrid cross between AABB x aabb and AaBb F1 heterozygotes is 1:1:1:1.
Linkage refers to the persistence of all of a chromosome's genes together, and the position of genes on the same chromosome is known as a linked gene.
Each organism has a limited number of chromosomes, so we can say that each chromosome contains many genes and that the genes on the same chromosome are linked. However, each organism has several characteristics that are controlled by thousands of genes.
It is an actual collaboration between qualities, which can not group freely during meiosis, doesn't comply with Menders law of autonomous variety, and limits the possibilities of hereditary recombination and new varieties among posterity.
In the first generation of a dihybrid cross, all offspring are heterozygous hybrids when two individuals with distinct traits cross.
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Q- Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?
1:1:1:1
1:3:3:1
1:2:2:1
4:3:2:1
which of the following species would have the greatest chance of going extinct?(1 point) responses a species with a slow reproduction rate and very little genetic variation living in a changing environment a species with a slow reproduction rate and very little genetic variation living in a changing environment a species with a fast reproduction rate and lots of genetic variation living in a stable environment a species with a fast reproduction rate and lots of genetic variation living in a stable environment a species with a slow reproduction rate and very little genetic variation living in a stable environment a species with a slow reproduction rate and very little genetic variation living in a stable environment a species with a fast reproduction rate and lots of genetic variation living in a changing environment
The species that would have the greatest chance of going extinct is a species with a slow reproduction rate and very little genetic variation living in a changing environment. Option B is correct.
This is because slow reproduction rate means that the species cannot adapt quickly to changes in the environment. Additionally, the lack of genetic variation means that the species has limited potential for genetic adaptation to changing conditions.
In a changing environment, the ability to adapt is crucial for survival, and species that cannot keep up with changes are at a higher risk of extinction. Therefore, a species with a slow reproduction rate and very little genetic variation living in a changing environment would be the most vulnerable to extinction.
Hence, B is the correct option.
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--The given question is incomplete, the complete question is
"Which of the following species would have the greatest chance of going extinct? A) a species with a slow reproduction rate and very little genetic variation living in a stable environment B) a species with a slow reproduction rate and very little genetic variation living in a changing environment C) a species with a fast reproduction rate and lots of genetic variation living in a changing environment."--
within a diploid animal species, what are potential sources of variation in shared, heritable traits? select all that apply.
Fertilization, meiosis, and mutations in the germ line are potential causes of variation in shared, inheritable traits. The correct answer is (A, D, and E).
Mutation, which can result in the creation of completely new alleles in a population, random mating, random fertilization, and recombination between homologous chromosomes during meiosis, which reshuffles alleles within an organism's offspring, are all examples of genetic variation.
Hereditary data is stored in units called genes. Mutations, genetic recombination, and population gene flow are the three primary sources of genetic variation.
Because they are encoded in our DNA, traits that are inherited can be transmitted to subsequent generations. Examples: hair color, height, eye color, and so on.
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Q- Within a diploid animal species, what are the potential sources of variation in shared, heritable traits? Select all that apply.
A) Fertilization
B) Mitotic division of somatic cells
C) Genetic engineering of somatic cells
D) Meiosis
E) Mutations in the germ line
a cell with 10 chromosomes undergoes mitosis and cytokinesis 1.how many daughter cells are produced? 2.how many chromosomes are in each daughter cell?
When a cell with 10 chromosomes undergoes mitosis and cytokinesis,
1) Two daughter cells are produced.
2) Each daughter cell has 10 chromosomes.
Here's a step-by-step explanation:
1. The cell begins with 10 chromosomes.
2. During the S phase of the cell cycle, each chromosome is replicated, resulting in 20 sister chromatids.
3. During mitosis, the sister chromatids are separated and equally distributed to two new cells.
4. Cytokinesis divides the cytoplasm, creating two separate daughter cells.
5. Each daughter cell now has 10 chromosomes, maintaining the original chromosome number.
Mitosis is a type of cell division in which one cell divides into two identical daughter cells. This process is essential for the growth, repair, and maintenance of all organisms.
Cytokinesis is the final stage of the mitotic cell cycle and involves the division of the cell's cytoplasm to form two separate daughter cells.
Mitosis and cytokinesis lead to the production of two daughter cells from one parent cell.
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For each organism and energy transfer described, write the energy role that the
organism is performing within its ecosystem.
consumer • producer • decomposer
Organism and Energy Transfer Energy Role
Bacteria on the ocean floor use chemical energy
to make food.
Alligators in a swamp feed on other animals.
Mushrooms in a forest break down dead trees.
Shrubs in a meadow use sunlight to produce their
own food.
Organism and Energy Transfer Energy Role Using Producer Eco system in the energy role that the organism is performing within its ecosystem.
When an organism needs to be divided into its component parts after it has died and needs to disintegrate in order to produce energy, the decomposer is used.
For the organism to receive the energy, it must consume another organism. The living thing that utilised sunlight or a synthetic material to create the meal is the producer.
Coral reefs in the Caribbean, for instance, are seriously in danger of disappearing due to factors including overfishing and tourist abuse. Another example of a sea that has collapsed and cannot be recovered is the Aral Sea.
Fishing will be impacted by climate change, which will have an impact on many species and habitats. Marine species displacement brought on by rising waters can result in high rates of local extinction in the tropics and oceans. Molluscs, echinoderms, and corals that make up reefs are extremely sensitive to fish and crustaceans, which can have negative effects on fishing.
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How do you draw a picture of
2n- diploid number of chromosomes (ex. Humans are 2n or 2*23=46)
A human cell has 46 chromosomes in total, which are divided into 23 pairs and two sets (one from each parent) in the ensuing karyotype.
What is the human 2n haploid number?For humans, each diploid cell contains 46 chromosomes. There are 22 pairs of inherited, or non-sex, chromosomes among them, and two of them determine sex. Two times as many chromosomes as those in a haploid cell, or 2n, make up the total amount of chromosomes in diploid cells. (n).
What chromosome does 2n 2 belong to?In this straightforward illustration, a diploid bodily cell has 2n = 2 chromosomes. Mom and parent each contributed one chromosome. 2n = 46 in people, so 23 were inherited from the mother and 23 from the father.
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Which human action has had the most positive ecological impact on the environment
The human action with the most positive ecological impact on the environment is the implementation of conservation and reforestation efforts. These actions help restore natural habitats, increase biodiversity, and reduce carbon dioxide levels in the atmosphere. By preserving and restoring ecosystems, we are protecting the environment and promoting the overall health of our planet.
Conservation efforts can include protecting natural habitats, creating and maintaining protected areas, and reducing or eliminating harmful human activities like overfishing or illegal wildlife trade. These actions help to preserve and restore natural ecosystems, which in turn supports biodiversity and the overall health of the environment.
Reforestation is another important action that can have a positive ecological impact. It involves planting trees in areas where they have been removed, which can help to restore forests and increase carbon sequestration. Trees absorb carbon dioxide from the atmosphere during photosynthesis, helping to mitigate the effects of climate change.
It is important to note that the effectiveness of these actions depends on the specific context and may vary. For example, reforestation may not be the most effective solution in areas where other land uses may be more appropriate. Additionally, conservation and reforestation efforts must be coupled with other actions to address the root causes of environmental degradation, such as reducing greenhouse gas emissions and improving sustainable practices in agriculture and industry.
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the membrane of most cells, including neurons, contains passive, open, k leak channels. given the normal k concentrations and the resultant concentration gradient, which direction would k be expected to move (diffuse) through these leak channels?
The membrane of most cells, including neurons, contains passive, open K+ leak channels.
The direction that potassium (k) would be expected to move (diffuse) through these passive, open k leak channels from an area of high concentration to an area of low concentration. Potassium (K) ions would be expected to move (diffuse) from the inside of the cell to the outside through these passive, open, K leak channels.
This movement is due to the concentration gradient, as there is a higher concentration of K ions inside the cell compared to the outside. The diffusion of K ions continues until the concentration gradient is balanced, or the cell reaches its resting membrane potential.
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how does gel electrophoresis allow researchers to identify particular dna sequences? group of answer choices by binding dna that is complementary to a target sequence, which allows visualization of the amount of complementary dna to a known sequence all of these the gel fluoresces when two complementary sequences bind, and the strength of fluorescence depends on their degree of similarity. by separating dna fragments by differences in length relative and comparing them to control dna fragments of known size
DNA fragments of various lengths can be distinguished using electrophoresis. The negatively charged nature of DNA causes it to move towards the positively charged electrode when an electric current is supplied to the gel.Thus, option b is correct
DNA fragments are only distinguished by size during gel electrophoresis. The quantity and size distribution of the various DNA fragments in a sample can be determined by the researchers using electrophoresis.
Based on their size and charge, DNA fragments (or other macromolecules, such as RNA and proteins) are separated using the gel electrophoresis process.
Current is sent through a gel containing the target molecules during electrophoresis. The molecules can be segregated from one another because they move through the gel in different directions or at different speeds depending on their size and charge.
Every DNA molecule has the same charge to mass ratio. As a result, DNA fragments are only distinguished by size during gel electrophoresis. The quantity and size distribution of the various DNA fragments in a sample can be determined using electrophoresis. Also, we can determine a portion of something's exact size.
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your heart is the most important muscle in your body. it is the pump that delivers oxygen rich blood throughout your body. your heart is made up of muscle. like all muscles it will become stronger with use. the type of exercise that will strengthen your heart is called . as it strengthens, it will become a more powerful pump that pushes more blood with each beat. what will happen to your resting heart rate as your heart gets stronger?
The resting heart rate gets stronger through regular exercise and it will become a more powerful pump that can push more blood with each beat.
The type of exercise that will strengthen your heart is called cardio exercise. Examples of cardio exercise include walking, running, swimming, cycling, and dancing. Through powerful pump, Heart will be able to supply your muscles with oxygen more efficiently, allowing you to exercise for longer periods of time before becoming fatigued.
A healthy resting heart rate can vary depending on factors such as age and fitness level, but a lower resting heart rate generally indicates better cardiovascular health. Regular exercise can help to lower your resting heart rate by increasing the efficiency of your heart. This means that your heart can pump the same amount of blood with fewer beats, resulting in a lower resting heart rate.
Overall, regular exercise can help to strengthen your heart and improve your cardiovascular health. This can result in a more efficient and effective cardiovascular system, as well as a lower resting heart rate.
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Multiple alleles and dominance hierarchy problems
Answer:
Alleles aren't always fully dominant or recessive to one another, but may instead display codominance or incomplete dominance.
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A parent cell with five duplicated chromosomes will produce daughter cells with five chromosomes consisting of one chromatid each.
Answer:
meiosis I
Explanation:
Meiosis is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately result in four cells with only one copy of each chromosome
Meiosis 1 refers to the initial stage of meiosis where one parent cell divides into two daughter cells. This stage is where homologous pairs of chromosomes will segregate and separate from each other and move into the two daughter cells which result in the division of the total chromosomal number by half.
A Labrador retriever breeder needs to determine if three male pups who were born to Sadie, his black Labrador
retriever, are the offspring of Sam, a yellow Labrador retriever from another breeder. Which process could the breeder
use to determine if Sam is the father of the pups?
O PCR analysis
O STR analysis
O mtDNA analysis
O Y-chromosome analysis
The process that the breeder could use to determine if Sam is the father of the pups is STR analysis.
The correct option is B
What is STR analysis?STR (short tandem repeat) analysis is a DNA profiling technique that compares the number of repeated DNA sequences at specific locations on the chromosomes of different individuals.
This technique is commonly used in paternity testing and can determine if a male dog is the biological father of a litter of puppies by comparing the STR profiles of the potential father and the offspring.
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a clinical microbiologist who wants to run a public health laboratory must have special certification from abmm. false false true
The given statement "a clinical microbiologist who wants to run a public health laboratory must have special certification from abmm." is False statement because certification from the American Board of Medical Microbiology (ABMM) can be beneficial for a clinical microbiologist working in a public health laboratory.
It is not necessarily required to run a public health laboratory. The specific qualifications and requirements for running a public health laboratory vary by jurisdiction, and can include a combination of education, training, and experience in microbiology and public health.
However, obtaining certification from ABMM can demonstrate a high level of expertise and knowledge in medical microbiology, which may be advantageous in obtaining employment or advancing in the field.
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As a result of rising temperatures, what changes could someone most likely predict about future generations of polar bears?
They will grow thicker, warmer coats.
They will grow thinner, darker fur.
They will lose their ability to swim.
They will become herbivores.
Answer:
They will grow thinner, darker fur.
Explanation:
This is because as temperatures rise, the Arctic sea ice melts, which makes it more difficult for polar bears to hunt their main prey, seals. As a result, they are likely to experience food shortages, which can lead to malnutrition and weight loss, resulting in thinner bodies. Additionally, as the sea ice melts, polar bears are forced to swim longer distances, which can also lead to increased energy expenditure and further weight loss. Therefore, it is unlikely that polar bears will grow thicker, warmer coats in response to rising temperatures.
a young boy who routinely bites his finger nails develops a wound on his right pointer finger. a culture reveals alpha hemolytic, dry colonies on the blood and cna plates that are catalase negative, resistant to optochin, and 6.5% nacl negative. gram stain of the colony is gram-positive cocci in chains. the organism most likely isolated is:
The organism isolated from the culture of Gram-positive cocci bacteria in chains which are catalase negative and resistant to optochin are: (c) Streptococcus viridians.
Gram positive bacteria are the types of bacteria which retain the color of the crystal violet stain. The cell wall of such bacteria are thick, mainly composed of peptidoglycan. Thus thick layer helps in retaining the stain.
Streptococcus viridians are streptococcal bacteria which are spherical in shape and attached to each other to form a chain. These bacteria are catalase negative which means they do not synthesize the catalase enzyme. Streptococcus yield a negative result in optochin sensitivity as well.
Therefore the correct answer is option c.
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The given question is incomplete, the complete question is:
A young boy who routinely bites his finger nails develops a wound on his right pointer finger. A culture reveals alpha hemolytic, dry colonies on the blood and CNA plates that are catalase negative, resistant to optochin, and 6.5% NaCl negative. Gram stain of the colony is Gram-positive cocci in chains. The organism most likely isolated is:
a. Enterococcus faecium
b. Enterococcus faecalis
c. Streptococcus viridians
d. Streptococcus agalactiae