Can someone clarify my multiple choice answers?

Question

1. All forms of passive diffusion depend on ...
A) energy from the cell in the form of ATP
B) ion channels
C) the kinetic energy of molecules
D) carrier proteins

I think it is C.

2. Most of the time, the environment that plant cells live in is
A) isotonic
B) hypertonic
C) hypotonic
D) none of these

I think it is C.

3. Gateway for ions to enter and leave a cell ...
A) hydrophobic end
B) hydrophilic end
C) protein channels
D) a, b, and c

I think it is C.

4. Sodium-potassium pumps ..
A) moves Na ions and K ions into a cell
B) moves Na ions and K ions out of a cell
C) moves Na ions out and K ions into a cell
D) moves Na ions into a cell and K ions out of the cell

I think it is C.

5. Membrane bound organelles are also referred to as ...
A) vesicles
B) channels
C) integral proteins
D) a and b

I think it is A.

Answer 1

1. 1. All forms of passive diffusion depend on ...
A) energy from the cell in the form of ATP
B) ion channels
C) the kinetic energy of molecules
D) carrier proteins

I think it is C.

You're definitely right. Process of elimination my friend. Passive diffusion is completely dependent on cell movement and the membrane has nothing to do with it. NO ATP required, no protein activity required, and it seems like when ions are used, it is so that you can stock up on potential energy then use proteins like ATP synthase to channel that energy and use it to make ATP. But ya.. passive, means no energy or work required.

2. Most of the time, the environment that plant cells live in is
A) isotonic
B) hypertonic
C) hypotonic
D) none of these

I think it is C.

You're right, it has to be or the plant cells would crinate (shrivel), the plant would go limp and eventually die. Which I'm sure you know since you said C.

3. Gateway for ions to enter and leave a cell ...
A) hydrophobic end
B) hydrophilic end
C) protein channels
D) a, b, and c

I think it is C.

Right. The hydrophobic side of the membrane will never encounter ions or the outside environment.

4. Sodium-potassium pumps ..
A) moves Na ions and K ions into a cell
B) moves Na ions and K ions out of a cell
C) moves Na ions out and K ions into a cell
D) moves Na ions into a cell and K ions out of the cell

I think it is C.

Yes, I always think of salt being bad for you (like high blood pressure). That's how I remembered it in Bio I.

5. Membrane bound organelles are also referred to as ...
A) vesicles
B) channels
C) integral proteins
D) a and b

I think it is A.

What the hell. I just know how we GOT double-membrane bound organelles, not what they are actually called. This kind of information is so useless. All eukaryotic organelles are membrane bound. Your teachers needs to stick it where the sun don't shine. Haha

But ya.. vesicles is probably the logical answer, I'm not saying it's right. Depends on your textbook, and when something depends on the text book, you know that the information is not useful later in your life, because it differs from reality.

Good luck haha

Answer 2

1C but not sure, definitely not A or D
2A - to maintain concentration other than isotonic would require more energy.
3C Proteins form hollow semipermeable channels.
4C - potassium within cells is higher than outside, vice versa for sodium.
5 not sure, but prob A, since B and C not organelles.