Question

Protoplasmic respiration is respiration

• A. Occurring in protoplasm
• B. Controlled by genetic factors
• C. Occurring outside the mitochondria
• D. Employing proteins as respiratory substrate

Answer 1

The correct option is D Employing proteins as respiratory substrate

The various organic substances such as carbohydrates, fats and proteins are respired completely to carbon dioxide and water are called respiratory substrates. Under natural conditions only carbohydrates are used. This respiration is called floating respiration. Glucose being the simplest monosaccharide hexose molecule acts as the chief respiratory substrate. If carbohydrates are used up and its shortage becomes acute, other protoplasmic substrates such as proteins may also be catabolized. This is termed protoplasmic respiration.

Thus, the correct answer is option D.