Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins?
(a) Glucose -6-phosphate
(b) Fructose 1,6-bisphosphate
(c) Pyruvic acid
(d) Acetyl Co-A
(d) Carbohydrates, fats and proteins all can be used as a substrate in cellular respiration. All of them first get converted to acetyl Co-A to enter into Kreb's cycle of aerobic cellular respiration. Thus, it is the common factor of respiration entering Kreb's cycle after breakdown of carbohydrates, fats and proteins