미해결 질문
What citric acid cycle intermediate(s) can be produced from the carbon atoms of each of the following amino acids?
a. tryptophan
b. histidine
c. threonine
d. phenylalanine
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21. The Generation of Biochemical Energy
The Citric Acid Cycle
Multiple Choice
Which enzyme oxidizes α-ketoglutarate in step 4 of the citric acid cycle?
A
isocitrate dehydrogenase
B
α-ketoglutarate oxidase
C
succinyl CoA synthase
D
α-ketoglutarate dehydrogenase
검증된 단계별 안내1
Understand the context: The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins into carbon dioxide and chemical energy.
Identify the role of enzymes: Enzymes are biological catalysts that speed up the rate of chemical reactions without being consumed in the process. In the citric acid cycle, each step is facilitated by a specific enzyme.
Focus on step 4 of the citric acid cycle: In this step, α-ketoglutarate is converted into succinyl-CoA. This conversion involves the oxidation of α-ketoglutarate.
Determine the enzyme responsible for this oxidation: The enzyme that catalyzes the oxidation of α-ketoglutarate to succinyl-CoA is α-ketoglutarate dehydrogenase. It facilitates the removal of electrons from α-ketoglutarate, which is a key part of the oxidation process.
Clarify the options: Among the given options, α-ketoglutarate dehydrogenase is the correct enzyme responsible for the oxidation of α-ketoglutarate in step 4 of the citric acid cycle.
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