Hi I would like to double check my answers. I think it is 1a,2a,3b,4d,5a,6c. Can

Question

Hi I would like to double check my answers. I think it is 1a,2a,3b,4d,5a,6c. Can you provide a brief explanation? Thanks!

Which of the following is not true regarding the Na+ - K+ pump?

a. It is a peripheral membrane protein.

b. It is electrogenic.

c. It requires ATP to function.

d. With each cycle, it moves 3 Na+ out of cells and 2 K+ into cells.

e. It has both hydrophobic and hydrophilic domains.

0.5 points   

Question 2

A bacterium is expelled from a warm human intestine to the colder world outside. What adjustment might the beast make to maintain the same degree of membrane fluidity it had inside the intestine? It could

a. It is a peripheral membrane protein.

b. It is electrogenic.

c. It requires ATP to function.

d. With each cycle, it moves 3 Na+ out of cells and 2 K+ into cells.

e. It has both hydrophobic and hydrophilic domains.

Explanation / Answer

1) A - all others are true

2) A - this would make the membrane more fluid which is necessary for colder environments (need stiffer membrane for hotter environments)

3) C - if there's no phosphate group release (energy rel) from GTP to GDP then no other processes with this signal transduction pathway can occur. it will not effect extracellular ligand to the receptor (GTP to GDP happens after)

4) D - Endocrine hormones travel all over in the blood (like a radio broadcast) to almost all tissues but only the cells with receptors for it (or radios) can respond (or hear the radio).

5) D - Cells that undergo pinocytosis envelop small particles and bring them into the cell with part of the membrane. If the proteins for pinocytosis aren't there but the cell is still producing a lot of cell membrane (to compensate for ingesting some) then there will be an increase in cell membrane or surface area.

6) C - These just allow certain ions through but they're down their concentration gradients. The other options involve energy (to move against the gradient) or are parts of signal transduction pathways.

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.