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Which molecule carries the acetyl group from pyruvate into the citric acid cycle?
AAcetyl CoA
BMalonyl CoA
COxaloacetate
DSuccinyl CoA
Answer & Solution
Correct answer: A. Acetyl CoA
1. Pyruvate must be modified before it can enter the next pathway.
2. It is attached to a carrier molecule during a transitional phase.
3. The major function of acetyl CoA is to deliver the acetyl group derived from pyruvate to the next stage of the pathway in glucose catabolism.
4. Oxaloacetate is the four-carbon molecule already waiting inside the cycle, and succinyl CoA appears later in it.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_
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