Question

Steps of respiration are controlled by

• A. Substrates
• B. Enzymes
• C. Hormone
• D. Bile juice

Answer 1

The correct option is B Enzymes

• Cellular respiration is the process by which cells convert glucose into carbon dioxide and water.
  
• Cellular respiration takes place in three steps: glycolysis, the citric acid cycle and oxidative phosphorylation.
• The main role of enzymes during the respiration reaction is to assist in transferring electrons from one molecule to another. e.g. In glycolysis, the enzyme dehydrogenase is used. Hence, the steps of respiration are controlled by enzymes.

So, the correct answer is 'enzymes'.