Question

The Krebs cycle forms many products. Which option lists the correct products of the Krebs cycle after 1 molecule of glucose goes through it?(1 point)
Responses

net 4 NADH, 4 ATP, 8 CO2, 4 FADH2
net 4 N A D H , 4 A T P , 8 C O sub 2 , 4 F A D H sub 2

net 1 NADH, 1 ATP, 2 CO2, 1 FADH2
net 1 N A D H , 1 A T P , 2 C O sub 2 , 1 F A D H sub 2

net 2 NAD+, 2 ATP, 4 CO2, 2 FADH
net 2 N A D plus , 2 A T P , 4 C O sub 2 , 2 F A D H

6 NADH, 2 ATP, 4 CO2, and 2 FADH2

Answer 1

To determine the products of the Krebs cycle (also known as the citric acid cycle or TCA cycle) after 1 molecule of glucose goes through glycolysis and then the Krebs cycle, we need to consider the overall process:

1. One molecule of glucose is converted into two molecules of pyruvate during glycolysis.
2. Each pyruvate enters the mitochondria and is converted into one acetyl-CoA, which then enters the Krebs cycle.
3. Each acetyl-CoA that enters the Krebs cycle results in the production of the following:

- 3 NADH
- 1 FADH2
- 1 ATP (or GTP)
- 2 CO2

Since one molecule of glucose produces two acetyl-CoA (one from each pyruvate), the total yield from one glucose molecule would be:

- **6 NADH** (3 NADH per acetyl-CoA x 2)
- **2 FADH2** (1 FADH2 per acetyl-CoA x 2)
- **2 ATP** (or GTP) (1 ATP per acetyl-CoA x 2)
- **4 CO2** (2 CO2 per acetyl-CoA x 2)

Given these calculations, the correct option from your responses is:

**6 NADH, 2 ATP, 4 CO2, and 2 FADH2.**