Answer:
The magnitude of the concentration gradient depends on the membrane permeability. The concentration gradient changes the available surface area. It is suggested that a high-permeability compound is absorbed mainly from the top of the villi, while a low-permeability
Explanation:
The period during which an excitable membrane cannot respond to further stimulation is the ________ period.
Answer:
refractory period
Explanation:
refractory period is a period of time during which an organ or cell is incapable of repeating a particular action
Fair weather, rain showers, clear and cold, and warm and windy are examples of which of the following?
A. weather alerts
B. weather conditions
C. weather movement
D. weather processes
Answer:
C. weather movement
Explanation:
correct me if im wrong
The biological theory of aging known as the _______ theory suggests that cells can divide a maximum number of about 75 to 80 times and that cells become less capable of dividing as people age.
Answer:
cellular clock theory
Explanation:
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Is light an essential condition for germination ?
why or why not ?
gamsahamnida
Answer:
No
Explanation:
Conditions necessary for germination are :
Temperature/Warmth
Oxygen/Air
Water/Moisture
Respiration is a process where many chemical bonds inside the body break and release energy. This energy is used to perform various activities such as moving muscles.
Explain the energy transformation in this process.
A. Chemical energy from broken bonds is transformed into mechanical energy for muscles.
B. Mechanical energy from broken bonds is transformed into chemical energy for muscles.
C. Mechanical energy from broken bonds is transformed into electrical energy for muscles.
D. Heat energy from broken bonds is transformed into electrical energy for muscles.
Chemical energy from broken bonds is transformed into mechanical energy for muscles. The correct option is A.
What is chemical energy?Chemical energy is the energy held in atom as well as molecule bonding.
Chemical energy can be located in things like batteries, biomass, oil, natural gas, and coal.
For instance, when humans burn wood in a fireplace or gasoline in a vehicle's engine, chemical energy is transformed into thermal energy.
Chemical energy, such as that held in the bonds of atoms and molecules, is stored energy. As a result of a chemical process, this energy is released.
Many chemical bonds throughout the body break during respiration, releasing energy. The movement of muscles is one activity that uses this energy.
Broken bonds' chemical energy is converted into mechanical energy for muscles.
Thus, the correct option is A.
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how would you differentiate between pollen cells and algae cells
Lymph is __________. excess tissue fluid that has escaped from arteries excess tissue fluid that has leaked out of capillaries excess blood that has escaped from veins
Answer:
Excess tissues fluid that has leaked out of capillaries.
A(n) is a protein and/or sugar molecule on the surface of a cell that allows the immune system to identify whether or not that cell poses a threat.
Answer:
Antigen
Explanation:
A group of students was asked to explain how one organelle in a plant cell directly supports the work or
another organelle to maintain cellular homeostasis. Which of the following students provides the BEST
explanation?
A. Student 1: Lysosomes supply amino acids which ribosomes use to build proteins.
B. Student 2: Vacuoles store genetic information which are used to construct the cell wall.
C. Student 3: Chloroplasts produce simple sugars which mitochondria use to provide energy for the cell.
D. Student 4: Golgi Bodies sort and package lipids which the Endoplasmic Reticulum uses to make proteins.
Answer:
Letter D. Golgi Bodies sort and package lipids which the Endoplasmic Reticulum uses to make proteins.
The student that provides the best explanation is as follows:
Student 3: Chloroplasts produce simple sugars which mitochondria use to provide energy for the cell.What is Cellular Homeostasis?Cellular homeostasis may be defined as the capability of a cell in order to maintain relative stability and function as alterations take place in the internal or external environment.
According to the question, the Lysosomes are the fatal or self destrcutive bags for living cells. Vacuoles store nutrients as well as waste substances of the whole cell in order to prevent cells from being contaminated.
The sorting of important molecules like lipids and proteins is initiated through the endoplasmic reticulum and proceeds to the Golgi bodies through the anterograde pathway.
While the photosynthetic organelle chloroplast captures the radiation energy from the sun and synthesizes simple sugar like glucose which is used by another organelle mitochondria to provide energy for the cell.
Therefore, the correct option for this question is C.
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4. Describe the interrelationship between cell, tissue and organ of human body.
Answer and Explanation:
Cell: Molecules get grouped in alive cellular units that have auto replication capabilities. It is the smallest structural unit capable of functioning by itself. A cell is capable of communicating with other cells, their membranes delimitate them and protect them, constituting a selectively permeable barrier, receives signals from the exterior and responds in different ways to the different signals. There are different cells with different sizes, shapes, and forms.
Tissue: A tissue is the organization and association of the same type of cells. Each tissue performs different functions. These tissues can be epithelial, adipose, nervous, muscular, and etcetera.
Organ: An organ is composed of different tissues that work together in a more complex function. Tissues form structures such as the heart, lung, kidney, brain, and etcetera. Each organ has its function.
Organ systems: When different organs get associated and work together, they become a system. Working together in a stable way organs maintain homeostasis.
This is a question on the circulatory system. I don't understand how the pathway that the blood goes through in the heart makes it oxygenated. Could someone pleas explain to me what each part does and how when it goes to the lungs it gets oxygenated?
Answer:
deoxygenated blood is pumped back to the heart with the superior vena cava and inferior vena cava. Blood is then in the right atrium then it is pushed to the right ventricle in the heart. it is the pumped through the pulmonary artery to the lungs(the pulmonary artery is the only artery that carries deoxygenated blood). In the lungs blood is pumped to the cappilleries in the bronchus where oxygen in the air is passed through to the blood with heamoglobin and thus now the blood is oxygenated. The blood is the pumped brought back to the heart with the pulmonary vein(the pulmonary vein is the only vein to carry oxygenated blood).It flows into the left atrium where it is then pushed down into the left ventricle and is then pumped up through the aorta to the whole body.
Explanation:
I hope this explains what you asked.
BRAINLIEST
the diagram shows two cells found in human blood.
a. the actual diagram of
red blood cell is 0.007mm ( 7 um) in diameter.
Calculate the magnification of the diagram. show your working.
side note: I measured it in a ruler and it's 2.3 cm = 23 mm (drawn to scale)
a)
Actual diameter = 0.007 mm
Diameter of scaled diagram = 2.3 cm = 23 mm
Formula to use:
Magnification = scaled dimension/actual dimension
Magnification = 23/0.007
Magnification = 3285.714... → x3286
b)
Red blood cells (RBCs), otherwise known as erythrocytes, don't have nuclei and organelles such as mitochondria, are smaller than WBCs and have a biconcave disc shape ideal for purpose
c)
i.
RBCs transport oxygen inhaled into the lungs around the body to all tissues and organs
ii.
RBCs are void of organelles so they are maximally packed with haemoglobin to bind and transport oxygen;
The biconcave disc shape is ideal for flowing through the blood vessels, particularly the capillaries, optimising them for transporting oxygen;
The small size also helps in being able to circulate the vasculature effectively and successfully
a)Actual diameter = 0.007 mm
Diameter of scaled diagram = 2.3 cm = 23 mm
Formula to use:
Magnification = scaled dimension/actual dimension
Magnification = 23/0.007
Magnification = 3285.714... → x3286
b)Red blood cells (RBCs), otherwise known as erythrocytes, don't have nuclei and organelles such as mitochondria, are smaller than WBCs and have a biconcave disc shape ideal for the purpose.
c)i.RBCs transport oxygen inhaled into the lungs around the body to all tissues and organs
ii.RBCs are void of organelles so they are maximally packed with haemoglobin to bind and transport oxygen;
What are RBCs?The biconcave disc shape is ideal for flowing through the blood vessels, particularly the capillaries, optimising them for transporting oxygen;The small size also helps in being able to circulate the vasculature effectively and successfully.
Thus, these are the answer.
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Chromosome number is reduced from 2n to 1n. this occurs in ___________
anaphase l
telophase l
anaphase ll
telophase ll
Answer:
I'm not completely sure but I think anaphase 2
Can Someone help me with this?? Your help will be very much appreciated ! Its somewhat confusing so Please help if you dont mind ? ❣️I would love someone that could answer this correctly !! Thank you <333!
Answer:
1)Protein is composed of amino acid.
We can identify protein by sequencing amino acids in peptide.
Carbohydrates is primarily avilabke energy source.
2) Proteins and nucleic acids are made up of C H O But carbohydrates and lipids consist of C H O N.
3)Nucleic acid DNA and RNA store and transmit genetic information from one generation to next generation.
Nucleic acid as present in body therefore not considered as essential nutrients.So dietary sources are plant and animal foods like meat fish vegetables etc.
Compare morphological and bio-
chemical evidence supporting
evolution.
The morphological evidence which is shown in fossils to modern animals supports evolution because some dinosaurs, for instance, had feathers and we can obviously see that trait today in birds. The biochemical evidence, which comes in the form of DNA comparison and amino acid similarities, shows that we related closely to monkeys and pigs, which suggests that we have close ancestors to these animals.
Morphological evidence: Physical structures and traits indicate evolutionary relationships.
Biochemical evidence: Genetic and molecular similarities indicate evolutionary relationships.
Evolution is supported by morphological evidence. Scientists can establish evolutionary links by analysing species' anatomy. Homologous structures, which have a common origin but diverse functions, reflect a shared lineage. Comparative examinations of bone structure, limb arrangement, or body plans can reveal evolutionary links.
Biochemical data emphasises genetic and molecular similarities between organisms. Scientists may compare DNA, protein, and other substances at the molecular level. Common ancestry and evolution explain these commonalities. Comparing genetic sequences can show how closely related species are and when they evolved from a common ancestor.
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why is it necessary to have 6co2 entering the chloroplast
which transcription factor binds directly to the tata-box sequence?
The transcription factor that binds directly to the tata-box sequence is TFIID. This transcription factor (TFIID) is a macromolecular protein complex.
The TATA box is a fundamental nucleotide gene sequence that forms the eukaryotic core promoters, which are required to initiate transcription.
TFIID is a macromolecular protein complex (also called the RNA polymerase II preinitiation complex), which acts as a general transcription factor during the initiation of eukaryotic transcription.
TFIID recognizes and binds to the TATA box (core promoter) and also binds with different activator and repressor proteins in order to regulate the transcriptional activity.
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A student is conducting an experiment with biochemical reactions and notices that at high temperatures, the reaction rate decreases significantly.
Which statement best explains the decrease in reaction rate?
The bonds of the substrate were breaking.
The enzyme bonded with the substrate.
The enzyme denatured and changed shape.
The activation energy was increasing.
Answer:
The enzyme denatured and changed shape
Explanation:
Enzymes are proteins, which can only function properly within a certain range of temperatures- when things get too hot, proteins undergo a structural change and are considered to be 'denatured'. This means that enzymes will not be able to function properly under those high temperatures, because the substrate bonding site would no longer be the right shape for said substrate.
The statement best explains the decrease in reaction rate is the enzyme denatured and changed shape. Thus option 3 is correct.
What are enzymes?Enzymes are defined as a material that functions as a catalyst in living things, controlling the pace at which chemical processes take place without changing the substance itself.
There are six types of enzymes.
HydrolysesOxidoreductaseLyasesTransferaseLigasesIsomeraseThe functions of enzymes are:
In human bodies, enzymes facilitate metabolic reactions. From breathing to digestion, they support.Health issues might result from having a too amount or too little of a certain enzyme. To help their bodies function as they should, certain persons with chronic diseases may need to take enzyme supplements.Thus, the statement best explains the decrease in reaction rate is the enzyme denatured and changed shape. Thus option 3 is correct.
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how is glaciers melting in alaska a problem for humans
Answer:
The water will rise
Explanation:
We can drown
what is the main factor that separates the biomes?
Answer:
Terrestrial biomes are distinguished primarily by their predominant vegetation, and are mainly determined by temperature and rainfall. Differences in temperature or precipitation determine the types of plants that grow in a given area .
The main factor that separates the biomes by predominant vegetation, temperature and rainfall.
What is biomes?Biomass is plant-based material used as fuel to produce heat or electricity. Examples are wood and wood residues, energy crops
Terrestrial biomes are distinguished primarily by their predominant vegetation, and are mainly determined by temperature and rainfall.
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The process of using sunlight to convert carbon dioxide and water into sugar and oxygen is called?
By keeping food cold, the growth of microorganisms is:
Answer:
they are called growth because you are training them
the specialized organelles that carry out photosynthesis are called
Answer:
Chloroplasts
Explanation:
what does the word gastropoda mean
Answer:
a large class of mollusks which includes snails, slugs, whelks, and all terrestrial kinds.
Explanation:
hope that helps :D!
pls help science kills me
Answer:
false
Explanation:
its the other way round!
Answer:
i am 90% sure its false
Explanation:
proteins for sure helps with strength and elasticity, id k what minerals do.
The force the Earth exerts on the sun is equal in magnitude to the
force the sun exerts on the Earth.
O True
o False
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The given statement is true, because according to Newton's third law of motion ~ " Every action has an equal and opposite reaction " .
PLZ HELP! what would happen to the current heliocentric model if entirely new evidence emerges that cannot be explained by the model?
Answer:
At least give some answers to go by, anyway, if the evidence is not yet proven then nothing, if it is proven to be true(whatever it is) it would make us change the current model to support this new evidence.
Explanation:
Don't expect a perfect answer, I haven't done the question to know the answer choices, so this is all I can presume. and if somebody comes in here and pastes the answer from A.P.E.X without stating that they copied it I am going lose my mind.
in the monohybrid crosses performed by mendel, the f1 plants always displayed ____.
in the monohybrid crosses performed by mendel, the f1 plants always displayed one trait
The answer to your question would be; one trait
I hope this helps!
Rabbits and sheep both graze on shrubs, grasses, and other plants. The sharp rise in the population of rabbits in a region may result in a shortage of plants for sheep to graze upon.
This relationship between sheep and rabbits is an example of _______.
A.
parasitism
B.
predation
C.
commensalism
D.
competition
The answer is D) competition.
We can see from the problem that the two animals are competing with one another. As the number of rabbits increases, the competition between the food source increases. This is why predators are important for the environment, as the level out the playing field for both animals.
I hope this helps! :)
how long does it take for a body to decompose to a skeleton
Answer:
In a temperate climate, it usually requires three weeks to several years for a body to completely decompose into a skeleton, depending on factors such as temperature, humidity, presence of insects, and submergence in a substrate such as water.
Explanation: