Question

In the Krebs cycle, how is citric acid formed?(1 point)
Responses

Pyruvic acid molecules are broken down by an acetyl group.
Pyruvic acid molecules are broken down by an acetyl group.

Acetyl-CoA joins with a large molecule called oxaloacetic acid.
Acetyl-CoA joins with a large molecule called oxaloacetic acid.

Enzymes combine hydrogen ions, oxygen, and electrons.
Enzymes combine hydrogen ions, oxygen, and electrons.

Carbon dioxide bonds with a chain of coenzyme A.
Carbon dioxide bonds with a chain of coenzyme A.

Answer 1

Acetyl-CoA joins with a large molecule called oxaloacetic acid.

(The acetyl group from acetyl-CoA (2C) combines with oxaloacetate (4C) to form citrate (6C) and release CoA.)