Need help with biology question?

Question

Thanks for taking the time to answer, and read this.

Question: A protein in the phospholipid bilayer binds with an ion, and then changes shape so that the ion can move into the cell. This is an example of
(A)osmosis (B)facilitated diffusion (C)endocytosis (D)active transport

The process in the question above: (A)requires energy (B)does not require energy

Thanks again!

Answer 1

B and B

Answer 2

The answer is firstly (B)Facilitated diffusion
because the protein that binds with the ion is helping, or "facilitating" the diffusion of the ion into the cell. It is not osmosis, because the substance moving is not water, it is an ion. It is not simply endocytosis, because the ion required the aid of the protein, and could not get in by itself. It is not active transport, since active transport is basically the cell or body reversing the natural flow of diffusion using energy.

The answer to the second part is (B) does not require energy
because the only form of diffusion that requires energy is active transport.

Answer 3

Just so you can explain/understand it more:

osmosis = diffusion of water. Happens when ions cannot get through the membrane (phospholipid bilayer).

facilitated diffusion = when ions or big molecules can't get into the membrane, but a protein can help go through it. Like...a tunnel in a mountain, in terms of an analogy. This happens without energy, because of diffusion. It goes with the flow

endocytosis = when a molecule gets into the cell, but the membrane forms a bubble around it....then disattaches from the whole cell membrane. Like, you have a big bubble...but then you press an object into it, and a smaller bubble forms inside the bigger bubble with the molecule in it

active transport = like facilitated diffusion, but you are moving stuff up the concentration gradient (rather than from high to low, you are going low to high). Since you are going opposite of nature, you need energy to do this.

So the answer is facilitated diffusion. And since it is going down its concentration gradient in this diffusion, it does NOT require energy.

Answer 4

Active transport does require energy. The cell is doing an activity Omosis involves liquids; facillitated diffusion uses a carrier molecule to make the action happen faster, this molececule enters the cell; and endocytosis is having a hole open in the cell.

Answer 5

facilitated diffusion

Answer 6

it's b and b

Answer 7

b,b

Answer 8

b, a