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Prep4USMLE Forum » USMLE Step 1 Forum » Biochemistry Forum

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mitty
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07/23/06 - 05:41 PM

A 25-year-old man eats 20 raw eggs a day to increase protein for his bodybuilding routine. This unusual diet affects the activity of which of the following enzymes?
a Acetyl coA carboxylase

b Acetyl CoA dehydrognase

c Fatty acid synthase

d Fatty acid thiokinase

e propionale coA carboxylase

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mjl1717
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07/23/06 - 05:54 PM

I guess answer- e propionale CoA carboxylse-- figuring it has something to do with avidin and biotin.?

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robin082006
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07/23/06 - 06:21 PM

how about A?

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study_ing
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07/24/06 - 01:39 AM

its definitely a carboxylase...
the point is which one exists...
can anyone please jot down the reactions the two catalyse

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DanVitor
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07/24/06 - 02:35 AM

It's A! AcetylCoA carboxylase, as most (if not all) carboxylases need biotin. Biotin is blocked by avidin.

It could be E if it was propionyl CoA. But since it is stated that it is propionate CoA, so I'll go with A!

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