Question

select all that apply
select the accurate statements concerning membrane fluidity.

• both anchored and unanchored proteins are fixed in space within the membrane and cannot easily move laterally.
• phospholipids interact strongly with each and cannot easily move laterally within the membrane.
• unanchored proteins are relatively free to move laterally within the membrane.
• phospholipids are relatively free to move laterally within the membrane.

Explanation:

1. Analyze the first option: Anchored proteins have restrictions, but unanchored proteins can move laterally, so this statement is wrong.
2. Analyze the second option: Phospholipids have weak interactions (like van der Waals) and can move laterally, so this statement is wrong.
3. Analyze the third option: Unanchored proteins are not bound tightly and can move laterally in the membrane, so this is correct.
4. Analyze the fourth option: Phospholipids in the membrane are relatively free to move laterally due to the fluid mosaic model, so this is correct.

Answer:

C. Unanchored proteins are relatively free to move laterally within the membrane, D. Phospholipids are relatively free to move laterally within the membrane