1. The fluid mosaic model governs the diffusion of which of the following bioche
ID: 69377 • Letter: 1
Question
1. The fluid mosaic model governs the diffusion of which of the following biochemicals?
A. CoQ
B. steroids
C. phospholipids
D. sphingolipids
E. all of these biochemicals
2. The complete -oxidation of an acyl-CoA, that contains a 18:0 fatty acid, would yield how many acetyl-CoA?
A. 1
B. 18
C. 0
D. 9
E. 20
3. During hibernation, thermogenin is a protein that has what property and function?
A. integral protein that channels protons to the matrix
B. peripheral protein that obtains electrons from the ETC
C. integral protein that channels protons into the cytosol
D. peripheral protein that channels electrons into the cytosol
E. integral protein that channels protons into the innermembrane space
Explain
Explanation / Answer
Answer 1- Option B
Since we are talking of diffusion here, we would consider steroids as they are very small in size and non polar, so they can easily diffuse across the phospholipid layers in the membrane.
Answer 2- Option D
Here we have saturated fatty acid, so in one cycle of beta oxidation, one acetyl co-A molecule is released. To completely break down a fatty acid into acetyl Co-A with 18 carbon atoms, we will have 9 Acetyl Co-A.
Answer 3- Option A
First of all, since there is movement of protons involved in the function of thermogenin, there would be Integral proteins involved. This makes options B and D incorrect.
Now secondly, protons move into the matrix without forming ATP. This is what happens in uncoupling.
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