Before most molecules can enter the Krebs citric acid cycle, they must be conver

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Home ‣ Microbiology ‣ Energy Release and Conservation Comments

Question
Before most molecules can enter the Krebs citric acid cycle, they must be converted to
Options
A. citric acid
B. oxaloacetic acid
C. NADH or FADH
D. acetyl-CoA

Correct Answer

acetyl-CoA

Energy Release and Conservation problems

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1. In anaerobic respiration, the final electron acceptor can be
Options
A. oxygen
B. nitrate
C. pyruvate
D. acetyl-CoA

Discuss

Correct Answer: nitrate

2. In lactic acid fermentation, the final electron acceptor would be
Options
A. fructose
B. pyruvate
C. glucose
D. acetyl-CoA

Discuss

Correct Answer: pyruvate

3. How many oxygen molecules are required in the fermentation of one molecule of glucose to ethanol and CO₂?
Options
A. 0
B. 1
C. 2
D. 36

Discuss

Correct Answer: 0

4. The amount of ATP produced by a cell from glucose when metabolizing it by fermentation means is
Options
A. greater than by aerobic metabolism
B. lesser than by aerobic metabolism
C. exactly or approximately equal to by aerobic metabolism
D. none of these

Discuss

Correct Answer: lesser than by aerobic metabolism

5. Glucose can be broken down to pyruvate by
Options
A. Entner-Doudoroff pathway
B. tricarboxylic acid cycle
C. both (a) and (b)
D. none of these

Discuss

Correct Answer: Entner-Doudoroff pathway

6. In cellular metabolism, O₂ is used
Options
A. to provide electrons for photophosphorylation
B. in glycolysis
C. as a terminal electron acceptor
D. in the Krebs cycle

Discuss

Correct Answer: as a terminal electron acceptor

7. Which one of the following is produced in the greatest numbers during one turn of the Krebs cycle?
Options
A. NADH
B. Acetyl-CoA
C. FADH₂
D. ATP

Discuss

Correct Answer: NADH

8. Organisms can synthesize ATP by oxidative phosphorylation when they
Options
A. ferment
B. oxidize glucose to pyruvate
C. pass electrons from the oxidation of chlorophyll through an electron transport system
D. pass electrons to oxygen through an electron transport system containing cytochromes

Discuss

Correct Answer: pass electrons to oxygen through an electron transport system containing cytochromes

9. Which one of the following is not produced in any of the steps of glycolysis?
Options
A. NAD⁺
B. NADH
C. ADP
D. ATP

Discuss

Correct Answer: NAD⁺

10. For each pair of electrons passing from NADH located inside the mitochondria to oxygen, how many ATP molecules can be generated?
Options
A. 1
B. 2
C. 3
D. 4

Discuss

Correct Answer: 3

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Before most molecules can enter the Krebs citric acid cycle, they must be converted to

Energy Release and Conservation problems

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