Biochemistry

The intermediate compound that links glycolysis with the TCA cycle is Acetyl CoA.

(A) Acetyl CoA - Correct: Pyruvate (glycolysis end product) is converted to acetyl-CoA by pyruvate dehydrogenase, which enters the TCA cycle.

(B) Pyruvic Acid - Incorrect: This is the direct end product of glycolysis, but requires conversion to acetyl-CoA first.

(C) OAA (Oxaloacetate) - Incorrect: This is a TCA cycle component that condenses with acetyl-CoA, not a glycolysis product.

(D) Citric Acid - Incorrect: This is the first product formed in TCA cycle after acetyl-CoA combines with OAA.

The correct answer is (A) Acetyl CoA, which serves as the crucial metabolic link between these pathways.