,1. Which of the following is not a product of the citric acid
cycle?
A. FADH2
B. ATP
C. NADH
D. Oxygen
Answer: D. Oxygen
Rationale: The citric acid cycle produces FADH2, ATP,
and NADH as part of cellular respiration, but oxygen is not a
product of this cycle.
2. During cellular respiration, the conversion of glucose to
pyruvate occurs during which phase?
A. Glycolysis
B. Krebs cycle
C. Electron transport chain
D. Pyruvate oxidation
Answer: A. Glycolysis
Rationale: Glycolysis is the metabolic pathway that
converts glucose into pyruvate, yielding ATP and NADH in
the process.
, chain where it accepts electrons and forms water,
facilitating the generation of a proton gradient used to
produce ATP.
4. In the absence of oxygen, which process can a cell use
to produce ATP?
A. Fermentation
B. Citric acid cycle
C. Oxidative phosphorylation
D. Pyruvate oxidation
Answer: A. Fermentation
Rationale: Fermentation allows cells to produce ATP
without oxygen by converting NADH back to NAD+ while
producing end products like lactic acid or ethanol.
5. Which enzyme is responsible for synthesizing ATP during
oxidative phosphorylation?
A. Cytochrome c oxidase
B. ATP synthase
C. Hexokinase
D. Pyruvate kinase
Answer: B. ATP synthase
Rationale: ATP synthase is the enzyme that produces
ATP from ADP and inorganic phosphate during oxidative
phosphorylation, powered by the flow of protons across the
mitochondrial membrane.
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