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31
What is produced from pyruvate under anaerobic conditions?
A:
Acetyl-CoA
B:
Lactate
C:
Ethanol
D:
NADH
32
Which enzyme catalyzes the first step of glycolysis?
A:
Phosphofructokinase
B:
Pyruvate kinase
C:
Hexokinase
D:
Aldolase
33
What is the net gain of ATP molecules from one molecule of glucose during glycolysis?
A:
1 ATP
B:
2 ATP
C:
4 ATP
D:
6 ATP
34
Where does glycolysis occur in the cell?
A:
Mitochondria
B:
Cytoplasm
C:
Nucleus
D:
Endoplasmic reticulum
35
What is the primary function of glycolysis?
A:
To generate oxygen
B:
To produce ATP
C:
To synthesize proteins
D:
To break down fatty acids
36
In fermentation _____ is reduced and _____ is oxidized.
A:
Pyruvate ... NADH
B:
Lactate ... NADH
C:
NADH ... Lactate
D:
NAD⁺ ... Pyruvate
37
In muscle cells, fermentation produces _____
A:
CO₂, ethanol, NADH, ATP
B:
Pyruvate
C:
Lactate and NAD⁺
D:
CO₂, ethanol, and NAD⁺
38
Most CO₂ from catabolism is released during
A:
Citric acid cycle
B:
Oxidative phosphorylation
C:
Glycolysis
D:
Electron transport
39
When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
A:
NAD⁺ is oxidized
B:
ATP synthase pumps protons
C:
Cytochromes phosphorylate ADP
D:
pH of the matrix increases
40
What is the oxidizing agent in the reaction: Pyruvate + NADH + H⁺ → Lactate + NAD⁺
A:
Oxygen
B:
Pyruvate
C:
NADH
D:
Lactate
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