Question

The term, "protoplasmic respiration" is used when the respiratory substrate is

• A. Carbohydrates.
• B. Protein.
• C. Organic acid.
• D. Lipid.

Answer 1

The correct option is B Protein.

Carbohydrates are the fuel of choice for cellular respiration. In case enough carbohydrates are not available, other biomolecules like fats and proteins can be used to supply for cellular energy requirements. Fats are burnt first when enough carbohydrates are not available. Proteins are used only when both carbohydrates and fats are not available. As metabolism of proteins result in breakdown of protoplasm. The process is also called as protoplasmic respiration.