Solve this:

155. The respiratory quotient during cellular respiration would depend on the

(a)  nature of the substrate
(b) amount of carbon dioxide released
(c) amount of oxygen utilized
(d) nature of enzymes involved

Dear student,
The correct answer is (a).The respiratory quotient or R.Q. is the ratio of the volume of carbon dioxide released to the volume of oxygen used in respiration.It depends on the nature of the substrate which has to be oxidized in the process of respiration.For example, the R.Q. for carbohydrates is one, for fats and proteins, it is less than one.It is greater than one for organic acids.

Regards