Question

At the complete end of cellular respiration, how many molecules of ATP are produced? A. 26 B. 38 C. 15 D. 34

Answer 1

The best answer would be B 38 molecules of ATP.

According to some of newer sources the ATP yield during aerobic respiration is not 36–38, but only about 30–32 ATP molecules / 1 molecule of glucose. So in new textbooks 30-32 molecules is stated but that’s not a choice in ur question.

Hope this helps

Answer 2

The correct answer will be option B (38).

Step-by-step explanation:

Cellular respiration or oxidation of glucose proceeds in three sequential reactions: .Glycolysis, Kreb cycle and Electron transport chain (ETC)

1 NADH₂ produces 3 ATP

1 FADH₂ produces 2 ATP

During Glycolysis produce -

NADH₂- 2 molecules =2x3 = 06 ATP

=2x4 = 08 ATP depending on shuttle system

ATP-phosphorylation = 02 ATP (utilized during process)

So, net ATPs synthesized in glycolysis are - 08 ATP.

During Link reaction and Krebs cycle -

NADH₂- 8 molecules = 8x3= 24 ATP

FADH₂- 2 molecules = 2x2= 04 ATP

ATP-phosphorylation= 02 ATP

so, net ATP produced in Link reaction and Krebs cycle are= 30 ATP

Hence, 08 ATP from glycolysis and 30 ATP from link and kreb cycle forms 38 ATP.

Thus, option B is the correct answer.