Question

Which statement about the citric acid cycle is correct?
a) The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.
b) The citric acid cycle oxidizes glucose to carbon dioxide.
c) The oxidation of compounds by the citric acid cycle requires molecular oxygen.
d) The citric acid cycle depends on the availability of NAD+, which is a product of glycolysis.
e) The citric acid cycle produces most of the ATP that is subsequently used by the electron transport chain.

Answer 1

A) The last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle.

Answer 2

The correct statement about the citric acid cycle is "the last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle"

CITRIC ACID CYCLE:

• Citric acid cycle or Krebs cycle is the second stage of aerobic cellular respiration. It involves a series of enzymatic and redox chemical reactions.

• The citric acid cycle is composed of eight steps starting from the combination of 2-carbon acetyl coA and 4-carbon oxaloacetate.

• The last reaction of the citric acid cycle involves the conversion of malate into oxaloacetate, which is one of the substrates for the first reaction.

• Therefore, the correct statement about the citric acid cycle is "the last reaction in the citric acid cycle produces a product that is a substrate for the first reaction of the citric acid cycle"

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