Bch 361 Exam 4 Clicker Updated Actual Questions And Correct Answers

BCH 361 EXAM 4 CLICKER UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. Why is the conversion of pyruvate to acetyl CoA a
decisive step in metabolism in animals?

Answer:
Animals cannot convert acetyl CoA back to glucose

Question:
2. Pyruvate dehydrogenase directly connects the following
two metabolic pathways:

Answer:
glycolysis and the citric acid cycle

Question:
3. This enzyme occupies the central position in the multi-
enzyme pyruvate dehydrogenase complex:

Answer:
dihydrolipoyl transacetylase

Question:
4. The lipoamide swinging arm is attached to this enzyme in
the PDH complex:

Answer:
dihydrolipoyl transacetylase

Question:
5. Conversion of dihydrolipoamide to lipoamide occurs at
this enzyme in the PDH complex:

Answer:
dihydrolipoyl dehydrogenase

Question:
6. This acetyl group is transferred to lipoamide in this
enzyme of the PDH complex:

Answer:
pyruvate dehydrogenase component

, Question:
7. With of these compounds is a stoichiometric coenzyme
for pyruvate dehydrogenase?

Answer:
CoA

Question:
8. Acetyl CoA is an important molecule in metabolic
pathways because:

Answer:
it contains a high energy thioester bond that can be used to drive chemical
reactions

Question:
9. Phosphorylation of the pyruvate dehydrogenase
complex:

Answer:
increases its catalytic activity

Question:
10. Acetyl CoA interacts with this PDH enzyme to inhibit PDH
complex activity:

Answer:
dihydrolipoyl transacetylase

Question:
11. In the first stage of the citric acid cycle, how many
carbon atoms are lost as carbon dioxide for each
molecule of citrate?

Answer:
2

Question:
12. By the end of the second stage of the citric acid cycle,
succinyl CoA has been converted into this 4-carbon
compound:

Answer:
oxaloacetate