Final answer:
During one turn of the citric acid cycle, 2 carbon atoms are removed as carbon dioxide. This process occurs as acetyl-CoA combines with a 4-carbon molecule and undergoes transformations. Therefore, the correct answer is option b.
Explanation:
Understanding Carbon Removal in the Citric Acid Cycle
The citric acid cycle, also known as the Krebs cycle, plays a crucial role in cellular respiration by breaking down acetyl-CoA into carbon dioxide (CO2) and transferring energy to ATP, NADH, and FADH2. During one full turn of the citric acid cycle, a total of 2 carbon atoms are removed in the form of CO2. This occurs through a series of enzymatic reactions where:
- Acetyl-CoA combines with a 4-carbon molecule (oxaloacetate) to form a 6-carbon molecule (citrate).
- Diverse biochemical transformations subsequently reduce the carbon framework, releasing 2 molecules of CO2.
Thus, the correct answer to the question is b. 2 carbon atoms are removed during one full turn of the citric acid cycle.
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