When something needs to be transported against its concentration gradient, or a molecule is too big to simply diffuse through a membrane, active transport has to be used. So active transport requires energy (ATP).
Examples:
1. Antiport pumps: transport one substance in one direction while transporting another substance the other way. An example of this is the sodium-potassium pump.
2. Symport pumps - uses a substance that wants to move from an area of high concentration to low concentration and carries another substance against its concentration gradient. An example of this is the sodium-glucose transport protein
3. Endocytosis - large amounts of extra cellular fluid can be taken into a cell - needs ATP to bind proteins in the cell membrane and causes them to change their shape...which eventually causes the surrounding of the fluid to be brought in (a vesicle).
4.exocytosis - opposite of above
You would not agree with Jaiden. There are three types of subatomic particles within atoms. These are known as protons, neutrons, and electrons.
A plant cell can make their own food eggs can not do that, a plant cell has one singular vacuole while eggs have many small ones, and plant cells have a cell wall and membrane
I believe the correct answer would be <span>variation. The definition of variation in biology means,</span><span> any difference
between cells, individual organisms, or groups of organisms of any
species caused either by genetic differences or by the effect of environmental factors on the expression of the genetic potentials. So i think that organisms can also be classified as variation. Hope this helped. ♥ ☺
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There are choices for this question namely:
<span>A) chromosomes.
B) dendrites
C) axon hillocks
D) synaptic axons
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The correct answer is chromosomes. All cells in the human body (except mature red blood cells and platelets, which do not have a nucleus) have chromosomes as genetic information contained inside the nucleus. Dendrites, axon hillocks, and synaptic axons; while true that they microscopic cellular structure, are unique to nerve cells or neurons.
