21.3 Aerobic respiration (1)

ATP produced in active cells acts as an energy carrier to provide energy to inactive cells

• True

• False

Both glycolysis and link reaction (pyruvate -> acetyl-CoA) produce ATP and NADH.

• True

• False

Coenzyme A serves as an acetyl donor to donate an acetyl group to the 4-C compound in the Krebs cycle in aerobic respiration

• True

• False

ATP can still be produced in glycolysis if there is no oxygen.

• True

• False

[DSE PP/07]

Which of the following correctly lists the substances formed in the Krebs cycle?

• water and NADH

• water and carbon dioxide

• carbon dioxide and NADH

• water, carbon dioxide and NADH

[DSE 2013/10; 67% correct]

Which of the following combinations best describes the processes involved in respiration?

• O^₂ is required: conversion of pyruvate to acetyl-CoA

  CO_² is released: glycolysis

• O^₂ is required: conversion of pyruvate to acetyl-CoA

  CO_² is released:

  Krebs cycle

• O₂ is required: oxidative phosphorylation

  CO₂ is released:

  glycolysis

• O₂ is required: oxidative phosphorylation

  CO₂ is released:

  Krebs cycle

[DSE 2016/26; 65% correct]

Which of the following processes in aerobic respiration release NADH?

(1)  glycolysis

(2)  Krebs cycle

(3)  oxidative phosphorylation

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Which of the following are produced in glycolysis and enter mitochondria?

(1) NAD

(2) pyruvate

(3) acetyl-CoA

(4) NADH

• (1) and (2) only

• (1) and (3) only

• (2) and (4) only

• (3) and (4) only