Which statement is correct about the Krebs cycle?

Question

Responses

Oxygen is a waste product of the Krebs cycle.
Oxygen is a waste product of the Krebs cycle.

Acetyl-CoA
combines with pyruvic acid to make glucose in the Krebs cycle.
Acetyl dash uppercase C lowercase o uppercase A combines with pyruvic acid to make glucose in the Krebs cycle.

In the Krebs cycle, carbon dioxide is used to make glucose.
In the Krebs cycle, carbon dioxide is used to make glucose.

The Krebs cycle produces electron carriers for the electron transport chain.
The Krebs cycle produces electron carriers for the electron transport chain.

Answer 1

The correct statement about the Krebs cycle is:

The Krebs cycle produces electron carriers for the electron transport chain.

To clarify the other statements:

1. Oxygen is a waste product of the Krebs cycle. - This is incorrect. Oxygen is not directly a waste product of the Krebs cycle; it is involved in the electron transport chain where it acts as the final electron acceptor.

2. Acetyl-CoA combines with pyruvic acid to make glucose in the Krebs cycle. - This is incorrect. Acetyl-CoA does not combine with pyruvic acid to make glucose. Instead, Acetyl-CoA enters the Krebs cycle, while pyruvic acid is converted to Acetyl-CoA before it enters the cycle.

3. In the Krebs cycle, carbon dioxide is used to make glucose. - This is also incorrect. The Krebs cycle does produce carbon dioxide as a byproduct, but it does not use it to make glucose.

In summary, the Krebs cycle plays a crucial role in cellular respiration by producing electron carriers (NADH and FADH2) that are then used in the electron transport chain.