Question

What are the molecules that normally supply carbon and oxygen atoms, respectively, for the citric acid cycle?

1) Oxaloacetate, oxaloacetate
2) Acetyl CoA, O₂
3) Oxaloacetate, O₂
4) Acetyl CoA, H₂O
5) Pyruvate, pyruvate

Answer 1

The molecules that supply carbon and oxygen atoms for the citric acid cycle are Acetyl CoA and O₂. Acetyl CoA delivers its acetyl group to oxaloacetate to form citric acid or citrate.

Step-by-step explanation:

The molecules that normally supply carbon and oxygen atoms, respectively, for the citric acid cycle are Acetyl CoA and O₂. Acetyl CoA delivers its acetyl group, which contains two carbon atoms, to a four-carbon molecule called oxaloacetate to form a six-carbon molecule known as citric acid or citrate.