AP BIOLOGY

CELL RESPIRATION

THE KREBS CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
How many ATP are made from 1 Acetyl CoA in Kreb’s cycle?
A
1
B
2
C
4
D
6
Explanation: 

Detailed explanation-1: -Each acetyl CoA enters into citric acid cycle and yields 3 NADH2 (9 ATP), 1 FADH2 (2 ATP) and 1 GTP (1 ATP). Therefore, altogether 12 ATP molecules will be produced from each mole of acetyl-CoA.

Detailed explanation-2: -1 NADH molecule gives its electrons to the electron transfer chain, and through the process of oxidative phosphorylation, 3 ATP molecules are produced. So, 1 molecule of pyruvate, through its conversion to acetyl CoA, produces 3 ATP molecules.

Detailed explanation-3: -In the Krebs cycle, two ATP, six NADH +H+, and two FADH2 were produced.

Detailed explanation-4: -10 ATP can be formed in total from one acetyl-CoA entering into the Krebs cycle (by the products of and ), along with one GTP molecule.

Detailed explanation-5: -One Acetyl-CoA yield 10 ATP. Therefore, two Acetyl CoA molecules will yield 20 ATP. One FADH2 molecule will yield 1.5 ATP. One NADH molecule will yield 2.5 ATP.

There is 1 question to complete.