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MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics

Mymensingh Board 2022

Correct information about the last step of the process in the stimulus is-

  1. i. it takes place in the mitochondrion
  2. ii. water is produced
  3. iii. 34 molecules of ATP are made

Think it through first, then pick an option.

  1. a i and ii
  2. b i and iii
  3. c ii and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: d i, ii and iii

The last step is the electron transport system: it occurs in the mitochondrion, makes water and gives 34 ATP (the other 4 of the 38 are made directly).

Why the other options are wrong

  • a i and ii: iii is also true: the electron transport system gives 34 ATP; so i and ii alone are incomplete.
  • b i and iii: ii is also true: water is produced in the electron transport system; so i and iii alone are incomplete.
  • c ii and iii: i is also true: the step takes place in the mitochondrion; so ii and iii alone are incomplete.