Q. In anaerobic conditions, pyruvate is converted to which substance?
-
A.
Acetyl-CoA
-
B.
Ethanol
-
C.
Lactate
-
D.
Oxaloacetate
Solution
Under anaerobic conditions, pyruvate is converted to lactate in humans.
Correct Answer:
C
— Lactate
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Q. What is the function of aldolase in glycolysis?
-
A.
Phosphorylation
-
B.
Cleavage
-
C.
Isomerization
-
D.
Dehydrogenation
Solution
Aldolase catalyzes the cleavage of fructose-1,6-bisphosphate into two three-carbon sugars.
Correct Answer:
B
— Cleavage
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Q. What is the net ATP yield from one molecule of glucose during glycolysis?
-
A.
2 ATP
-
B.
4 ATP
-
C.
6 ATP
-
D.
0 ATP
Solution
The net yield of ATP from glycolysis is 2 ATP per molecule of glucose.
Correct Answer:
A
— 2 ATP
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Q. What is the primary end product of glycolysis?
-
A.
Lactate
-
B.
Pyruvate
-
C.
Acetyl-CoA
-
D.
Glucose
Solution
The primary end product of glycolysis is pyruvate, which is formed from glucose.
Correct Answer:
B
— Pyruvate
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Q. What is the role of phosphofructokinase in glycolysis?
-
A.
Regulatory enzyme
-
B.
Energy production
-
C.
Substrate-level phosphorylation
-
D.
Dehydrogenation
Solution
Phosphofructokinase is a key regulatory enzyme that controls the rate of glycolysis.
Correct Answer:
A
— Regulatory enzyme
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Q. Which enzyme catalyzes the conversion of glucose to glucose-6-phosphate in glycolysis?
-
A.
Hexokinase
-
B.
Phosphofructokinase
-
C.
Pyruvate kinase
-
D.
Aldolase
Solution
Hexokinase catalyzes the phosphorylation of glucose to glucose-6-phosphate.
Correct Answer:
A
— Hexokinase
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Q. Which molecule acts as the electron carrier in glycolysis?
-
A.
NAD+
-
B.
FAD
-
C.
CoA
-
D.
ATP
Solution
NAD+ acts as the electron carrier, being reduced to NADH during glycolysis.
Correct Answer:
A
— NAD+
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Q. Which of the following is NOT a product of glycolysis?
-
A.
NADH
-
B.
ATP
-
C.
FADH2
-
D.
Pyruvate
Solution
FADH2 is not produced in glycolysis; it is produced in the citric acid cycle.
Correct Answer:
C
— FADH2
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Q. Which step of glycolysis involves substrate-level phosphorylation?
-
A.
Conversion of glucose to glucose-6-phosphate
-
B.
Conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate
-
C.
Conversion of phosphoenolpyruvate to pyruvate
-
D.
Conversion of fructose-1,6-bisphosphate to glyceraldehyde-3-phosphate
Solution
The conversion of phosphoenolpyruvate to pyruvate involves substrate-level phosphorylation, producing ATP.
Correct Answer:
C
— Conversion of phosphoenolpyruvate to pyruvate
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