객관식
Which of the following occurs during the citric acid cycle?
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3. Energy & Cell Processes
Krebs Cycle
객관식
How many molecules of carbon dioxide are released during one turn of the citric acid cycle?
A
3
B
1
C
2
D
4
검증된 단계별 안내1
Understand the citric acid cycle: 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 in the form of ATP.
Identify the key steps in the cycle where carbon dioxide is released: During the citric acid cycle, carbon dioxide is released in two specific steps. These occur during the conversion of isocitrate to α-ketoglutarate and the conversion of α-ketoglutarate to succinyl-CoA.
Examine the chemical reactions: In the first reaction, isocitrate is oxidized to α-ketoglutarate by the enzyme isocitrate dehydrogenase, releasing one molecule of carbon dioxide. In the second reaction, α-ketoglutarate is converted to succinyl-CoA by the enzyme α-ketoglutarate dehydrogenase, releasing another molecule of carbon dioxide.
Count the total number of carbon dioxide molecules released: Since each of these reactions releases one molecule of carbon dioxide, a total of two molecules of carbon dioxide are released during one turn of the citric acid cycle.
Summarize the process: The citric acid cycle involves multiple steps, but specifically, two steps release carbon dioxide, resulting in the release of two molecules of carbon dioxide per cycle turn.
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