Answer :
The kreb cycle is the joining of oxaloacetate to acetyl CoA. the chemistry performed has an organic chemistry name reaction is called as aldol addition reaction.
The first step of the kreb cycle is the joining of oxaloacetate to acetyl CoA. the first step of the kreb's cylcle is also reffered as the citric acid cycle or also known as tricarboxylic acid that is TCA cycle that involves in the addition of the oxalo acetate to the acetyl CoA. this reaction is called as the aldol addition reaction.
Thus the reaction follows in the first step of the kreb's cycle is the aldol addition reaction.
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