Answer:
The two most important factors determining the movement of ions across the cell membrane are: the permeability of the molecule in the membrane, and the existence of an energy source.
Explanation:
Ions are charged molecules that, no matter their size, cannot pass through the membrane by simple diffusion because of the nature of the lipid bilayer of the membrane.
Ions can move across the cell membrane in two different ways: passive transport and active transport. The disparity between these two relies on the usage of ATP (energy) - <u>passive transport doesn't need ATP while active transport does</u>. This is where the availability of a source of energy is important, because if there isn't, then active transport is impossible.
On the other hand, ions can move through the cell membrane without the use of energy by diffusing through the membrane with the help of specific membrane proteins that form channels for ions to pass through - and this is where permeability matters: if the cell membrane is permeable to a specific ion, it means that it has opened channels for that ion to use; and this ion will move from one fluid to the other (intracellular or extracellular) following its concentration gradient (for example, sodium is poorly concentrated in the inside of the cell, while is highly concentrated on the outside - this means that sodium will go through the membrane to get inside the cell and even the concentrations between the two fluids, but only if the membrane is permeable to sodium!).
Answer:
D. determine the probability of traits
Answer:
Muscle cells use more energy than skin cells.
Explanation:
This is because muscles are what make you move, they are needing a lot more energy to move. Mitochondria are the organelles that <u>make energy</u>, they are the <u>Powerhouse</u> of the cell.
Active transport requires energy because it moves molecules across a membrane to a region of lower to higher concentration which is often against their concentration gradient or has an obstructing factor.
Answer:
Algae, Plants, some bacteria and some protists.
Explanation:
Organisms which make their own food through the process of photosynthesis are called autotrophs. Members of the kingdom Monera as unicellular, prokaryotes. Examples are eubacteria and archaea. Some bacteria have the capability to make their own food through photosynthesis. Some members of the kingdom Protista such as various types of algae, diatoms, dinoflagellates are autotrophs. All the green plants have chlorophyll which make their own food through photosynthesis are autotrophs.