Reaction 1: Synthesis of Citric Acid
Acetyl CoA and oxaloacetic acid condense to form citric acid.
The acetyl group CH3COO is transferred from CoA to oxaloacetic
acid at the ketone carbon, which is then changed to an alcohol.
The net effect is to join a 2 carbon piece with a 4 carbon piece
to make citric acid which is 6 carbons. This is just called the
synthesis of citric acid.
This reaction is catalyzed by citric acid synthetase.