Concept explainers
Interpretation:
Each of the given chemical compounds should be identified as a part of the citric acid cycle, electron transport chain or both.
Concept introduction:
► Citric acid cycle includes various reactions which occur in living cells during aerobic respiration. In this cycle, acetyl-CoA is oxidized for releasing carbon dioxide and energy in the form of ATP.
► Electron transport chain is the last step of aerobic respiration and includes a sequence of
To identify: Each of the given compounds as a part of citric acid cycle, electron transport chain or both.
Answer to Problem 23.51UTC
Solution:
(a) Citric acid cycle.
(b) Electron transport chain.
(c) Both citric acid cycle and electron transport chain.
(d) Electron transport chain.
(e) Citric acid cycle.
Explanation of Solution
(a) Succinate is a chemical species formed from Succinyl CoA during citric acid cycle. It produces fumarate after its reaction with succinic dehydrogenase.
For this reason, succinate is a part of citric acid cycle.
(b) is a chemical species that produces complex III along with cytochrome c reductase (-cytochrome creductase complex) and helps in transfer of electrons.
For this reason, is a part of electron transport chain.
(c) FAD (Flavin adenine dinucleotide) is a cofactor of redox reactions. It helps in controlled redox reactions in both citric acid cycle and electron transport chain and releases energy as ATP.
For this reason, FADis a part of both citric acid cycle and electron transport chain.
(d) Cyt c (Fe2+) is a type of hemeprotein found in mitochondrial membrane. It participates in electron transport chain and helps in transfer of electrons.
For this reason, cyt c (Fe2+) is a part of electron transport chain.
(e) Citrate is a chemical species formed from acetyl-CoA during citric acid cycle. It produces cis-aconitate after its reaction with aconitase.
For this reason, α-ketoglutarate is a part of citric acid cycle.
Each of the given chemical compounds is identified as a part of citric acid cycle, electron transport chain or both.
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Chapter 23 Solutions
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