Question

during cellular respiration, acetyl coa is made from pyruvic acid when _______. oxygen is present oxygen is absent carbon dioxide is present carbon dioxide is absent need help? review these concept resources. rate your confidence to submit your answer. high medium low reading © 2025 mcgraw hill. all rights reserved. privacy center terms of use

Explanation:

In cellular respiration, pyruvic acid is converted to acetyl - CoA in the presence of oxygen through a process called pyruvate oxidation, which occurs in the mitochondria. This is part of aerobic respiration. When oxygen is absent, pyruvic acid undergoes fermentation instead of being converted to acetyl - CoA. The presence or absence of carbon dioxide is not directly related to the conversion of pyruvic acid to acetyl - CoA.

Answer:

oxygen is present