Bioenergetics Mdcat Mcqs

 



1. Bioenergetics is the study of:

A. Energy flow in living organisms
B. Cell division
C. DNA replication
D. Protein synthesis

Answer: A. Energy flow in living organisms

2. The main energy currency of the cell is:

A. ADP
B. ATP
C. NADH
D. FADH₂

Answer: B. ATP

3. The breakdown of glucose to release energy is called:

A. Photosynthesis
B. Respiration
C. Fermentation
D. Transpiration

Answer: B. Respiration

4. The first step of cellular respiration is:

A. Krebs cycle
B. Electron transport chain
C. Glycolysis
D. Oxidative phosphorylation

Answer: C. Glycolysis

5. Glycolysis occurs in the:

A. Mitochondrial matrix
B. Cytoplasm
C. Nucleus
D. Ribosome

Answer: B. Cytoplasm

6. Total ATP produced from one glucose molecule in aerobic respiration is approximately:

A. 2 ATP
B. 4 ATP
C. 36–38 ATP
D. 100 ATP

Answer: C. 36–38 ATP

7. The Krebs cycle occurs in the:

A. Cytoplasm
B. Mitochondrial matrix
C. Inner mitochondrial membrane
D. Nucleus

Answer: B. Mitochondrial matrix

8. The electron transport chain is located in the:

A. Outer mitochondrial membrane
B. Cytoplasm
C. Inner mitochondrial membrane
D. Nucleus

Answer: C. Inner mitochondrial membrane

9. The final electron acceptor in aerobic respiration is:

A. Carbon dioxide
B. Oxygen
C. Hydrogen
D. Nitrogen

Answer: B. Oxygen

10. NAD⁺ functions mainly as a:

A. Structural protein
B. Electron carrier
C. Hormone
D. Enzyme inhibitor

Answer: B. Electron carrier

11. Anaerobic respiration in muscles produces:

A. Ethanol
B. Lactic acid
C. Acetic acid
D. Pyruvate

Answer: B. Lactic acid

12. The process that synthesizes ATP using a proton gradient is:

A. Substrate level phosphorylation
B. Photophosphorylation
C. Oxidative phosphorylation
D. Fermentation

Answer: C. Oxidative phosphorylation

13. The energy released during respiration is stored temporarily in:

A. DNA
B. ATP
C. RNA
D. Lipids

Answer: B. ATP

14. Which coenzyme carries hydrogen to the electron transport chain?

A. NADH
B. ATP
C. CO₂
D. ADP

Answer: A. NADH

15. The net ATP produced in glycolysis is:

A. 1
B. 2
C. 4
D. 6

Answer: B. 2


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