Question

multiple choice question during which step of the krebs cycle are electron carriers used? acetyl coa combines with a 4 - carbon compound to form a 6 - carbon compound known as citric acid. acetyl coa and citric acid are generated and the cycle continues. citric acid is broken down, releasing two molecules of carbon dioxide and generating one atp, three nadh, and one fadh₂.

Explanation:

In the Krebs cycle, electron - carriers (NADH and FADH₂) are generated throughout the cycle, but the key step where the process starts using them for energy transfer and further reactions is after the formation of citric acid. Acetyl - CoA combines with a 4 - carbon compound to form citric acid. Then, as citric acid is broken down, electron - carriers are produced and used in subsequent redox reactions to generate ATP. The initial step of acetyl - CoA combining with a 4 - carbon compound to form citric acid is the starting point of a series of reactions where electron - carriers play a crucial role.

Answer:

Acetyl CoA combines with a 4 - carbon compound to form a 6 - carbon compound known as citric acid.