Multiple choice TCA Cycle starts with the condensation of acetyl group with OAA and water To yield Citric Acid All Reveal answer Fill a bubble to check yourself D Correct answer Explanation The Krebs cycle begins with the condensation of the 2-carbon acetyl group from Acetyl-CoA with the 4-carbon Oxaloacetic acid (OAA) in the presence of water to form Citric acid.