In the Presence of Oxygen, the Three-Carbon Compound Pyruvate Can

question 36

Multiple Choice

In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate (1) loses a carbon, which is given off as a molecule of CO₂, (2) is oxidized to form a two-carbon compound called acetate, and (3) is bonded to coenzyme A. Which of the following sets of products result from these reactions?

• A) acetyl CoA, O₂, and ATP
• B) acetyl CoA, FADH₂, and CO₂
• C) acetyl CoA, NADH, and CO₂
• D) acetyl CoA, NAD⁺, ATP, and CO₂

---

Definitions:

Unconditioned Stimulus

A natural stimulus that effortlessly elicits a response with no learning required.

Conditioned Response

The learned response to a previously neutral stimulus that, after conditioning, comes to elicit a reaction through association with an unconditioned stimulus.

Asymptotic Level

The maximum level of conditioning.

Conditioned Response

The learned reaction or response to a previously neutral stimulus that, after conditioning, comes to elicit a specific response.