AP BIOLOGY

CELL RESPIRATION

THE KREBS CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
After glycolysis, pyruvate oxidation, and Kreb’s cycle, how many net ATP are made from one glucose?
A
2
B
4
C
6
D
10
Explanation: 

Detailed explanation-1: -The net energy output for one glucose molecule from glycolysis through the Krebs cycle is: 4 ATP, 10 NADH + H+, and 2 FADH2.

Detailed explanation-2: -During glycolysis, glucose ultimately breaks down into pyruvate and energy; a total of 2 ATP is derived in the process (Glucose + 2 NAD+ + 2 ADP + 2 Pi–> 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H2O).

Detailed explanation-3: -In glycolysis, there is a net gain of 2 ATPs. 2 ATPs are produced in the TCA cycle per glucose molecule (2 acetyl CoA).

Detailed explanation-4: -In anaerobic respiration, 4 molecules of glucose produce 8 ATP.

Detailed explanation-5: -1: Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules: Glycolysis, or the aerobic catabolic breakdown of glucose, produces energy in the form of ATP, NADH, and pyruvate, which itself enters the citric acid cycle to produce more energy.

There is 1 question to complete.