Question

Which statements about the citric acid cycle are true? Select all that apply. 1. Co2 is released 2. ATP is consumed 3. Pyruvate is produced 4. NADH and FADH2 are produced

Answer 1

In the citric acid cycle, CO2 is released and molecules of NADH and FADH2 are produced. ATP is not consumed but produced, and pyruvate is not a product but a reactant that is converted into acetyl CoA before entering the cycle.

Step-by-step explanation:

The citric acid cycle is a key metabolic pathway that takes place in the mitochondria of cells. In response to which statements about the citric acid cycle are true, here are the factual details:

• CO2 is released: True. Two carbon dioxide molecules are released for each acetyl group that enters the cycle.
• ATP is consumed: False. Instead, one ATP (or GTP, depending on the cell type) is produced via substrate-level phosphorylation.
• Pyruvate is produced: False. Pyruvate is actually converted into acetyl CoA before it enters the citric acid cycle.
• NADH and FADH2 are produced: True. Three molecules of NADH and one molecule of FADH2 are produced in each cycle.

Therefore, the statements that CO2 is released and NADH and FADH2 are produced are true for the citric acid cycle.

Answer 2

The first turn of the citric acid cycle produces CO2, NADH, FADH2, and ATP.