Question

Total number of $\text{ATP}$ produced through $\text{ETS}$ only from one molecule of $3$-phosphoglycerate in aerobic respiration is

• A. $14$
• B. $12$
• C. $15$
• D. $16$

Answer 1

The correct option is A $14$

Starting from one molecule of 3-phosphoglycerate in glycolysis, there will be $\text{1 NADH}$ formed from the formation of pyruvate and they will form 2 acetyl co-$A$.

One molecule of acetyl $\text{CO-A}$ that enters the Kreb's cycle will form $\text{3NADH}$ and ${\text{1FADH}}_2$. These $\text{NADH}$ and ${\text{FADH}}_2$ will now take part in $\text{ETS}$.

Total $\text{4 NADH}$ will give $\text{4 × 3 = 12 ATP}$.

Total ${\text{1 FADH}}_2$ will give $\text{1 × 2 = 2 ATP}$.

So, total of $\text{14 ATP}$ will be formed.