Multiple Select Question

Question

Using the model, select three statements that correctly describe cellular respiration.

A.
Water is a byproduct of the Krebs cycle.

B.
The Krebs cycle occurs in the mitochondrion.

C.
The electron transport chain occurs in the cytosol.

D.
Oxygen is required for the electron transport chain.

E.
Electrons are carried from glycolysis and the Krebs cycle.

F.
Glycolysis results in the most ATP molecules being formed.

Answer 1

The three statements that correctly describe cellular respiration are:

A. Water is a byproduct of the Krebs cycle.

B. The Krebs cycle occurs in the mitochondrion.

D. Oxygen is required for the electron transport chain.

Explanation:

• A is correct because water is produced as a byproduct when electrons are transferred to oxygen in the electron transport chain, which is often linked with the Krebs cycle.

• B is correct because the Krebs cycle (or citric acid cycle) takes place in the mitochondria.

• C is incorrect because the electron transport chain occurs in the inner mitochondrial membrane, not the cytosol.

• D is correct because the electron transport chain requires oxygen as the final electron acceptor.

• E is correct but can be a bit vague depending on interpretation. Electrons are carried from glycolysis (via NADH) and the Krebs cycle (via NADH and FADH2) to the electron transport chain.

• F is incorrect because glycolysis produces a small yield of ATP compared to the total ATP produced through aerobic respiration, especially during the Krebs cycle and electron transport chain.