Questions on Cellular Respiration
20 multiple choice questions on Cellular Respiration, numbered with answers at the end.
Multiple Choice Questions: Cellular Respiration
1. What is the primary purpose of cellular respiration?
A) To produce glucose
B) To generate ATP
C) To absorb sunlight
D) To release oxygen
2. Which molecule is the main energy currency produced in cellular respiration?
A) DNA
B) NADH
C) ATP
D) Glucose
3. Where does glycolysis occur in the cell?
A) Mitochondrial matrix
B) Cytoplasm
C) Chloroplast
D) Nucleus
4. What is the end product of glycolysis?
A) Pyruvate
B) Acetyl-CoA
C) Carbon dioxide
D) Oxygen
5. Which molecule enters the Krebs cycle after glycolysis?
A) Glucose
B) Pyruvate
C) Acetyl-CoA
D) ATP
6. Where does the Krebs cycle take place?
A) Cytoplasm
B) Mitochondrial matrix
C) Outer mitochondrial membrane
D) Thylakoid membrane
7. What gas is released as a byproduct during cellular respiration?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Methane
8. Which molecules donate electrons to the electron transport chain?
A) ATP and glucose
B) NADH and FADH₂
C) Oxygen and carbon dioxide
D) Pyruvate and acetyl-CoA
9. Where is the electron transport chain located?
A) Cytoplasm
B) Inner mitochondrial membrane
C) Outer mitochondrial membrane
D) Cell membrane
10. What is the final electron acceptor in aerobic cellular respiration?
A) Carbon dioxide
B) Oxygen
C) NAD+
D) Water
11. Which process produces the most ATP during cellular respiration?
A) Glycolysis
B) Krebs cycle
C) Electron transport chain
D) Fermentation
12. What molecule is produced when oxygen accepts electrons at the end of the electron transport chain?
A) Carbon dioxide
B) Water
C) ATP
D) Glucose
13. How many ATP molecules are approximately produced per glucose molecule during aerobic respiration?
A) 2
B) 12
C) 36–38
D) 100
14. What is anaerobic respiration?
A) Respiration that uses oxygen
B) Respiration that occurs in chloroplasts
C) Respiration without oxygen
D) Respiration in plants only
15. Which process occurs in muscle cells under anaerobic conditions?
A) Alcoholic fermentation
B) Lactic acid fermentation
C) Krebs cycle
D) Photosynthesis
16. What happens to pyruvate in aerobic respiration?
A) Converted into lactate
B) Converted into acetyl-CoA
C) Converted into ethanol
D) Stored as glycogen
17. Which molecule carries electrons and hydrogen ions from glycolysis and Krebs cycle to the electron transport chain?
A) ATP
B) NAD+
C) NADH
D) Glucose
18. In cellular respiration, ATP synthase:
A) Breaks down glucose
B) Synthesizes ATP from ADP and phosphate
C) Transfers electrons
D) Produces oxygen
19. Which of the following is NOT a stage of cellular respiration?
A) Glycolysis
B) Krebs cycle
C) Electron transport chain
D) Photosynthesis
20. What happens to the energy released during cellular respiration?
A) Converted into heat and ATP
B) Stored as glucose
C) Released as light
D) Stored as oxygen
Answer Key
1. B – To generate ATP
2. C – ATP
3. B – Cytoplasm
4. A – Pyruvate
5. C – Acetyl-CoA
6. B – Mitochondrial matrix
7. C – Carbon dioxide
8. B – NADH and FADH₂
9. B – Inner mitochondrial membrane
10. B – Oxygen
11. C – Electron transport chain
12. B – Water
13. C – 36–38
14. C – Respiration without oxygen
15. B – Lactic acid fermentation
16. B – Converted into acetyl-CoA
17. C – NADH
18. B – Synthesizes ATP from ADP and phosphate
19. D – Photosynthesis
20. A – Converted into heat and ATP
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