Question

Which of the following is the first chemical step in respiration?

Options

• Glycolysis

• Krebs cycle

• Calvin cycle

• Photophosphorylation

Answer 1

Glycolysis

Explanation:

The process of breathing is divided into two stages. Phase I reactions are known as glycolysis and are found in both aerobic and anaerobic respiration. Whether or not O₂ is used in phase II affects the reactions.