Open Question
Which citric acid cycle intermediate(s) can be produced from the carbon atoms of each of the following amino acids?
a. serine
b. lysine
c. methionine
d. glutamate
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21. The Generation of Biochemical Energy
The Citric Acid Cycle
Multiple Choice
Which two steps of the citric acid cycle produce CO2?
A
1 and 3
B
3 and 4
C
2 and 4
D
2 and 3
Verified step by step guidance1
Understand that 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 acetate derived from carbohydrates, fats, and proteins into carbon dioxide.
Recall that during the citric acid cycle, carbon dioxide (CO2) is released as a byproduct of the decarboxylation reactions.
Identify the specific steps in the citric acid cycle where decarboxylation occurs. These are the steps where CO2 is produced.
In the citric acid cycle, the first decarboxylation occurs when isocitrate is converted to α-ketoglutarate, releasing CO2. This is step 3.
The second decarboxylation occurs when α-ketoglutarate is converted to succinyl-CoA, releasing another CO2. This is step 4.
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