Chapter 28. Problem 28.27

Problem-Solving Video Assessment
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Problem 28.27: Labels

(Questions 1 & 2) Assume that you have an in vitro system for synthesizing fatty acids using the radioactive acetyl CoA shown below:

Radioactive acetyl CoA

1.

What will be the 14C:3H ratio after the synthesis of lauric acid (C12) using this system?

A.
B.
C.
D.
E.
_feedback_correct: Correct. _feedback_incorrect: Incorrect.

2.

You add unlabeled propionyl CoA, a three-carbon molecule, to your system. Odd-chain fatty acids are synthesized using propionyl CoA as the initial starting molecule that condenses with malonyl CoA. What will be the 3H:14C ratio after the synthesis of the odd-chain fatty acid tridecylic acid (C13) in this scenario?

A.
B.
C.
D.
E.
_feedback_correct: Correct. _feedback_incorrect: Incorrect.

3.

Assume that you have an in vitro system for synthesizing fatty acids using the radioactive acetyl CoA shown below:

Radioactive acetyl CoA

How many radioactive carbons will be incorporated into myristic acid (C14) after it is synthesized using this system?

A.
B.
C.
D.
E.
_feedback_correct: Correct. _feedback_incorrect: Incorrect.

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