Question

what is the common component of TCA and ETC ?​

Answer 1

Explanation:

glycolysis produces substrates for TCA (pyruvate at first, but is then made to Acetyl CoA via pyruvate oxidation), TCA produces substrates for ETC (NADH/FADH2 which are the electron carriers).

Think of Glycolysis as a prerequisite to the TCA cycle. In order for Glucose to generate ATP, it needs to be converted to Pyruvate via Glycolysis. Pyruvate then is converted to Acetyl-Coa, this is how 2 carbons from Glucose are entering the TCA cycle.

During TCA cycle you produce NADH and FADH2. You produce 3NADH and 1 FADH2 per one molecule of Acetyl-Coa.

NADH and FADH2 will donate their electrons to the ETC (Electron Transport chain) so that ATP synthase can make ATP.