Question

Identify how many carbons from one glucose molecule enter one round of the Krebs cycle

Answer 1

The answer is, all three carbons from glucose molecules enters the Kreb cycle. But three at a time only. One molecule is broken down to two pyruvate molecules and then used in Krebs cycle. Which means that one glucose molecules leads to two cycles of the Kreb cycle with three carbons going to the cycle at one time.