Cell Biology Multiple Choice Questions on “Aerobic Respiration – Adenosine Triphosphate”.
1. Mitochondria are not able to transport NADH from cytosol.
A. True
B. False
Answer: A
Clarification: The reduced coenzymes FADH2 and NADH are produced during the TCA cycle. Mitochondria are not able to import the NADH from cytosol and there are two mechanisms that allow electrons to reach mitochondrial electron transport chain and be used for ATP production.
2. How many molecules of ATP are formed from the catabolism of one glucose molecule?
A. 12
B. 24
C. 36
D. 48
Answer: C
Clarification: By complete catabolism of one molecule of glucose by glycolysis and TCA cycle, 36 molecules of adenosine triphosphate (ATP) are formed.
3. TCA cycle is a __________ process and glycolysis is a ______________ process.
A. aerobic, anaerobic
B. anaerobic, aerobic
C. aerobic, aerobic
D. oxidation, reduction
Answer: A
Clarification: Tricarboxylic acid (TCA. cycle is an aerobic oxidative metabolism whereas glycolysis is anaerobic oxidative metabolism.
4. Ionic gradient in which part of the mitochondrion drives the synthesis of ATP?
A. matrix
B. outer membrane
C. inner membrane
D. DNA
Answer: C
Clarification: The inner membrane of mitochondrion maintains an ionic gradient across its inner membrane to drive energy requiring activities mainly ATP synthesis.
5. Oxidative phosphorylation and substrate-level phosphorylation are two different processes of ATP synthesis.
A. True
B. False
Answer: A
Clarification: Oxidative phosphorylation is a process where the energy released by electrons removed during substrate oxidation drives the formation of ATP. Substrate-level phosphorylation involves the transfer of phosphate group from substrate to ADP, leading to generation of ATP.