Q. What is the energy yield of one molecule of glucose during aerobic respiration?
-
A.
2 ATP
-
B.
30-32 ATP
-
C.
36-38 ATP
-
D.
4 ATP
Solution
The complete oxidation of one molecule of glucose during aerobic respiration yields approximately 30-32 ATP.
Correct Answer:
C
— 36-38 ATP
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Q. What is the main byproduct of aerobic respiration?
-
A.
Lactic acid
-
B.
Ethanol
-
C.
Carbon dioxide
-
D.
Oxygen
Solution
Carbon dioxide is the main byproduct of aerobic respiration.
Correct Answer:
C
— Carbon dioxide
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Q. What is the primary function of the Krebs cycle?
-
A.
ATP production
-
B.
Carbon fixation
-
C.
Electron transport
-
D.
Energy extraction from acetyl-CoA
Solution
The primary function of the Krebs cycle is to extract energy from acetyl-CoA through a series of reactions.
Correct Answer:
D
— Energy extraction from acetyl-CoA
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Q. What is the primary molecule used by cells for energy transfer?
-
A.
Glucose
-
B.
ATP
-
C.
NADH
-
D.
FADH2
Solution
ATP (adenosine triphosphate) is the primary energy carrier in cells.
Correct Answer:
B
— ATP
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Q. What is the role of NADH in cellular respiration?
-
A.
Energy storage
-
B.
Electron carrier
-
C.
Protein synthesis
-
D.
Cell division
Solution
NADH acts as an electron carrier in cellular respiration, transferring electrons to the electron transport chain.
Correct Answer:
B
— Electron carrier
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Q. Which metabolic pathway occurs in the cytoplasm and breaks down glucose?
-
A.
Krebs cycle
-
B.
Glycolysis
-
C.
Electron transport chain
-
D.
Beta-oxidation
Solution
Glycolysis is the metabolic pathway that occurs in the cytoplasm and breaks down glucose.
Correct Answer:
B
— Glycolysis
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Q. Which of the following is NOT a product of the Krebs cycle?
-
A.
NADH
-
B.
FADH2
-
C.
ATP
-
D.
Glucose
Solution
Glucose is not a product of the Krebs cycle; it is consumed in glycolysis.
Correct Answer:
D
— Glucose
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Q. Which organelle is primarily responsible for ATP production?
-
A.
Nucleus
-
B.
Ribosome
-
C.
Mitochondrion
-
D.
Endoplasmic reticulum
Solution
Mitochondria are the organelles responsible for ATP production through cellular respiration.
Correct Answer:
C
— Mitochondrion
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Q. Which process converts glucose into ATP in the presence of oxygen?
-
A.
Fermentation
-
B.
Glycolysis
-
C.
Aerobic respiration
-
D.
Anaerobic respiration
Solution
Aerobic respiration is the process that converts glucose into ATP using oxygen.
Correct Answer:
C
— Aerobic respiration
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Q. Which process occurs in the absence of oxygen and produces lactic acid?
-
A.
Aerobic respiration
-
B.
Glycolysis
-
C.
Lactic acid fermentation
-
D.
Krebs cycle
Solution
Lactic acid fermentation occurs in the absence of oxygen and produces lactic acid.
Correct Answer:
C
— Lactic acid fermentation
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