Acetyl-S-CoA Carboxylase Part 2 (Transcarboxylase)

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Science, Biology, Chemistry
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University
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Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of lysine in the biotin carboxylase mechanism?
It interacts with bicarbonate.
It binds to ATP.
It stabilizes the enzyme structure.
It acts as a nucleophile.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does biotin interact with different domains in the enzyme complex?
By binding to ATP.
By changing its charge state.
By rotating along with lysine.
By altering its pH.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a key feature of the transcarboxylase mechanism?
It is highly conserved across enzymes.
It is unique to each enzyme.
It requires a metal cofactor.
It does not involve biotin.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of aspartate in the active site?
It binds to biotin.
It stabilizes the enzyme structure.
It acts as a proton donor.
It donates electrons.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is generated during the tautomerization of acetyl CoA?
A stable enolate.
A protonated lysine.
A tetrahedral intermediate.
A nucleophilic acyl substitution.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which carbon in malonyl CoA originates from bicarbonate?
The central carbon.
The terminal carbon.
The carbonyl carbon.
The carboxylate carbon.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the carboxyl group in malonyl CoA during fatty acid synthesis?
It forms a new bond with acetyl CoA.
It is incorporated into the fatty acid.
It is lost as carbon dioxide.
It is converted to a hydroxyl group.
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