After three rounds of fatty acid synthase activity, what size is the fatty acyl intermediate?Group of answer choicesA) 4 carbons longB) 5 carbons longC) 8 carbons longD) 9 carbons longE) 10 carbons long
Question
After three rounds of fatty acid synthase activity, what size is the fatty acyl intermediate?Group of answer choicesA) 4 carbons longB) 5 carbons longC) 8 carbons longD) 9 carbons longE) 10 carbons long
Solution
Fatty acid synthase is an enzyme that catalyzes the synthesis of long-chain fatty acids. This process occurs through a series of reactions, each adding two carbon atoms to the fatty acid chain.
Here's the step-by-step process:
- The process begins with an acetyl-CoA molecule, which has 2 carbon atoms.
- In the first round of fatty acid synthase activity, a malonyl-CoA molecule (which has 3 carbon atoms) is added to the acetyl-CoA. However, one carbon atom is lost as CO2 during this process, so the resulting fatty acyl intermediate is 4 carbons long.
- In the second round, another malonyl-CoA is added and another carbon atom is lost, resulting in a fatty acyl intermediate that is 6 carbons long.
- In the third round, the same process occurs again, resulting in a fatty acyl intermediate that is 8 carbons long.
So, after three rounds of fatty acid synthase activity, the fatty acyl intermediate is 8 carbons long. Therefore, the correct answer is C) 8 carbons long.
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