CST Review Questions: Quiz 262 June 16, 2016 by admin Which of the following statement(s) is not true concerning various energy sources? a. Carbohydrate is the most efficient source of energy b. Endogenous fat is the major source of energy during starvation c. The respiratory quotient of carbohydrate is greater than either fat or protein d. Ketones can be used as a source of energy during starvation Δ