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BIO 101 Unit 3 Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% Latest
Already Graded A+
1. Which of the following best defines cellular respiration?
A) The process by which plants convert sunlight into chemical energy.
B) The set of metabolic reactions that break down glucose to produce
ATP.
C) The synthesis of glucose from carbon dioxide and water.
D) The transport of oxygen across cellular membranes.
Answer: B
Explanation: Cellular respiration is the process by which cells harvest
energy stored in glucose and other organic molecules to produce
adenosine triphosphate (ATP), the primary energy currency of the cell.
Option A describes photosynthesis; C is the reverse of respiration; D is a
component of gas exchange but not the overall process.
2. Where in the eukaryotic cell does glycolysis occur?
A) Mitochondrial matrix
B) Cytoplasm
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C) Inner mitochondrial membrane
D) Nucleus
Answer: B
Explanation: Glycolysis takes place in the cytoplasm of the cell,
independent of organelles. It is the first step of cellular respiration and
does not require oxygen. The mitochondrial matrix and inner membrane
host the Krebs cycle and electron transport chain, respectively.
3. Which molecule is the final electron acceptor in the electron
transport chain during aerobic respiration?
A) Water
B) NAD+
C) Oxygen
D) Carbon dioxide
Answer: C
Explanation: Oxygen serves as the final electron acceptor in aerobic
respiration, combining with electrons and protons to form water. This
maintains the flow of electrons through the chain and allows ATP
synthesis. NAD+ and carbon dioxide are involved in other steps.
4. What is the net ATP yield from glycolysis per glucose molecule?
A) 1 ATP
B) 2 ATP
C) 4 ATP
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D) 36 ATP
Answer: B
Explanation: Glycolysis produces a gross of 4 ATP but consumes 2 ATP in
the investment phase, resulting in a net of 2 ATP per glucose. The
remaining energy is stored in NADH molecules, which will be used later
in oxidative phosphorylation.
5. During the Krebs cycle, which of the following is produced?
A) Glucose
B) Pyruvate
C) Citrate
D) Acetyl-CoA
Answer: C
Explanation: The Krebs cycle begins when acetyl-CoA combines with
oxaloacetate to form citrate. This six-carbon molecule is then
progressively broken down to regenerate oxaloacetate, releasing
carbon dioxide and generating ATP, NADH, and FADH2.
6. Which of the following processes is anaerobic?
A) Krebs cycle
B) Glycolysis
C) Electron transport chain
D) Oxidative phosphorylation
Answer: B
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Explanation: Glycolysis does not require oxygen and can proceed under
anaerobic conditions. The Krebs cycle, electron transport chain, and
oxidative phosphorylation all require oxygen either directly or indirectly.
7. Fermentation occurs when:
A) Oxygen is abundant
B) NADH is oxidized to NAD+
C) ATP is produced in the mitochondria
D) Glucose is completely oxidized to carbon dioxide
Answer: B
Explanation: Fermentation regenerates NAD+ from NADH, allowing
glycolysis to continue when oxygen is unavailable. It does not produce
additional ATP beyond glycolysis and does not require mitochondria.
8. Which of the following is a product of alcohol fermentation?
A) Lactic acid
B) Ethanol and carbon dioxide
C) Acetyl-CoA
D) Water
Answer: B
Explanation: Alcohol fermentation produces ethanol and carbon dioxide
as end products. It occurs in yeast and some bacteria. Lactic acid is the
product of lactic acid fermentation.
BIO 101 Unit 3 Exam 2026-2027 BANK QUESTIONS
WITH DETAILED VERIFIED ANSWERS EXAM
QUESTIONS WILL COME FROM HERE (100% Latest
Already Graded A+
1. Which of the following best defines cellular respiration?
A) The process by which plants convert sunlight into chemical energy.
B) The set of metabolic reactions that break down glucose to produce
ATP.
C) The synthesis of glucose from carbon dioxide and water.
D) The transport of oxygen across cellular membranes.
Answer: B
Explanation: Cellular respiration is the process by which cells harvest
energy stored in glucose and other organic molecules to produce
adenosine triphosphate (ATP), the primary energy currency of the cell.
Option A describes photosynthesis; C is the reverse of respiration; D is a
component of gas exchange but not the overall process.
2. Where in the eukaryotic cell does glycolysis occur?
A) Mitochondrial matrix
B) Cytoplasm
,2|Page
C) Inner mitochondrial membrane
D) Nucleus
Answer: B
Explanation: Glycolysis takes place in the cytoplasm of the cell,
independent of organelles. It is the first step of cellular respiration and
does not require oxygen. The mitochondrial matrix and inner membrane
host the Krebs cycle and electron transport chain, respectively.
3. Which molecule is the final electron acceptor in the electron
transport chain during aerobic respiration?
A) Water
B) NAD+
C) Oxygen
D) Carbon dioxide
Answer: C
Explanation: Oxygen serves as the final electron acceptor in aerobic
respiration, combining with electrons and protons to form water. This
maintains the flow of electrons through the chain and allows ATP
synthesis. NAD+ and carbon dioxide are involved in other steps.
4. What is the net ATP yield from glycolysis per glucose molecule?
A) 1 ATP
B) 2 ATP
C) 4 ATP
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D) 36 ATP
Answer: B
Explanation: Glycolysis produces a gross of 4 ATP but consumes 2 ATP in
the investment phase, resulting in a net of 2 ATP per glucose. The
remaining energy is stored in NADH molecules, which will be used later
in oxidative phosphorylation.
5. During the Krebs cycle, which of the following is produced?
A) Glucose
B) Pyruvate
C) Citrate
D) Acetyl-CoA
Answer: C
Explanation: The Krebs cycle begins when acetyl-CoA combines with
oxaloacetate to form citrate. This six-carbon molecule is then
progressively broken down to regenerate oxaloacetate, releasing
carbon dioxide and generating ATP, NADH, and FADH2.
6. Which of the following processes is anaerobic?
A) Krebs cycle
B) Glycolysis
C) Electron transport chain
D) Oxidative phosphorylation
Answer: B
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Explanation: Glycolysis does not require oxygen and can proceed under
anaerobic conditions. The Krebs cycle, electron transport chain, and
oxidative phosphorylation all require oxygen either directly or indirectly.
7. Fermentation occurs when:
A) Oxygen is abundant
B) NADH is oxidized to NAD+
C) ATP is produced in the mitochondria
D) Glucose is completely oxidized to carbon dioxide
Answer: B
Explanation: Fermentation regenerates NAD+ from NADH, allowing
glycolysis to continue when oxygen is unavailable. It does not produce
additional ATP beyond glycolysis and does not require mitochondria.
8. Which of the following is a product of alcohol fermentation?
A) Lactic acid
B) Ethanol and carbon dioxide
C) Acetyl-CoA
D) Water
Answer: B
Explanation: Alcohol fermentation produces ethanol and carbon dioxide
as end products. It occurs in yeast and some bacteria. Lactic acid is the
product of lactic acid fermentation.
