Which of the following are correct about cellular respiration? Choose the correct answer from the options given below :
- A, C, D, E only
- A, B, E only
- A, B, C, E only
- B, C, D, E only
Answer
(1) A, C, D, E only
Solution
A. Correct: cellular respiration is the breaking of C–C bonds of complex organic molecules by oxidation, releasing energy.
B. Incorrect: glycolysis takes place in the cytoplasm; only the Krebs cycle and ETS take place in mitochondria.
C. Correct: under anaerobic conditions (e.g. germinating seeds in waterlogged soil) pyruvate undergoes fermentation.
D. Correct: the fate of pyruvate depends on the cellular needs and the type of organism (lactic acid, ethanol or aerobic oxidation).
E. Correct: at the end of ETS, O2 accepts electrons and protons and is reduced to water.
A, C, D, E are correct.
Answer: (1)