Krebs Cycle Overview in Under a Minute

Welcome to Biochemistry Essentials, a series where I break down high-yield biochem in under

a minute to help you remember more—not just for class, but for later tests like the MCAT.

Follow to ace your classes! Today, let’s look at the Krebs cycle,

also known as the citric acid cycle. After glycolysis, each pyruvate molecule is converted into

acetyl-CoA by the pyruvate dehydrogenase complex—the same complex we discussed yesterday.

That acetyl-CoA then enters the Krebs cycle, where it combines with oxaloacetate

to form citrate, beginning the series of reactions. Each turn of the cycle generates

2 CO₂, 3 NADH, 1 FADH₂, and 1 GTP or ATP, depending on the