Question

during which step of cellular respiration is pyruvate produced? * a glycolysis b the krebs cycle c electron transport chain glycolysis krebs cycle electron transport chain both a and b

Explanation:

Cellular respiration has three main stages: glycolysis, the Krebs cycle, and the electron transport chain. Glycolysis is the first stage, where glucose (a 6 - carbon molecule) is broken down into two molecules of pyruvate (a 3 - carbon molecule). The Krebs cycle uses pyruvate (after it is converted to acetyl - CoA) and does not produce pyruvate. The electron transport chain is involved in ATP production using the energy carriers from the previous stages and does not produce pyruvate. So pyruvate is produced during glycolysis.

Answer:

A. Glycolysis