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AP Biology MCQ
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21
Which compound can enter anabolic pathways from glycolytic intermediates?
A:
Glucose only
B:
Pyruvate only
C:
Both glucose and pyruvate
D:
None of these
22
What role does glyceraldehyde-3-phosphate play in glycolysis?
A:
It is a product that exits the pathway.
B:
It serves as an energy carrier.
C:
It acts as a substrate for further reactions.
D:
It inhibits hexokinase activity.
23
Which enzyme catalyzes the conversion of phosphoenolpyruvate to pyruvate?
A:
Phosphofructokinase
B:
Pyruvate kinase
C:
Aldolase
D:
Enolase
24
What does fructose-6-phosphate convert into during glycolysis?
A:
Glucose-6-phosphate
B:
Fructose-1,6-bisphosphate
C:
Glyceraldehyde-3-phosphate
D:
Pyruvate
25
Which reaction in glycolysis has a large negative ΔG and is essentially irreversible?
A:
Reaction 1 (Hexokinase)
B:
Reaction 5 (Triose phosphate isomerase)
C:
Reaction 7 (Phosphoglycerate kinase)
D:
Reaction 10 (Pyruvate kinase)
26
What happens to NAD+ during glycolysis?
A:
It is consumed.
B:
It is reduced to NADH.
C:
It is oxidized.
D:
It is converted to FADH2.
27
Which of the following statements about glycolytic intermediates is true?
A:
They can easily diffuse out of the cell.
B:
Most are phosphorylated metabolites.
C:
They do not participate in other metabolic pathways.
D:
They are all five-carbon sugars.
28
What type of phosphorylation occurs during glycolysis?
A:
Oxidative phosphorylation
B:
Substrate-level phosphorylation
C:
Photophosphorylation
D:
Chemiosmotic phosphorylation
29
How many reactions are involved in glycolysis?
A:
5
B:
7
C:
10
D:
12
30
Which of the following is an intermediate of glycolysis?
A:
Acetyl-CoA
B:
Fructose-1,6-bisphosphate
C:
Citrate
D:
Oxaloacetate
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