
Concept explainers
(a)
Interpretation:
Atoms that are added or removed in each step needs to be determined.
Concept Introduction:
The citric acid cycle is an eight steps cycle which consists enzyme catalyzed reactions occur in mitochondria. The citric acid cycle starts by the addition of 2 carbon acetyl CoA molecule to four carbon substrate. Acetyl CoA is regenerated at the end of the cycle.
In step 2 of citric acid cycle, citrate is converted to isocitrate. This conversion is a two-step process which has an intermediate called aconitate.
(b)
Interpretation:
The reason due to which step [2a] and [2b] are not considered
Concept Introduction:
During oxidation of a compound, electrons or hydrogens are lost or oxygen is gained. During the reduction of a compound, electrons or hydrogens are gained or oxygen is lost. Coenzymes act as oxidizing agents or reducing agents. Oxidizing agent drives the oxidation reaction and gets reduced. Reducing agent drives reduction reactions and gets oxidized.
(c)
Interpretation:
Type of reaction occurs in step [2a] and [2b] needs to be determined.
Concept Introduction:
The citric acid cycle is an eight steps cycle which consists enzyme catalyzed reactions occur in mitochondria. The citric acid cycle starts by the addition of 2 carbon acetyl CoA molecule to four carbon substrate. Acetyl CoA is regenerated at the end of the cycle.
In step 2 of citric acid cycle, citrate is converted to isocitrate. This conversion is a two-step process which has an intermediate called aconitate.

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Chapter 23 Solutions
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