Refer to the Figure Below

Multiple Choice

Refer to the figure below. Five statements about energy metabolism in cells are given.Which statement can be used to explain the importance of the process shown in the figure?

A) Oxidation of molecules from glucose is coupled to reduction of oxygen, which allows for controlled release of energy in a form that the cell can use.
B) The free energy of electron transport is coupled to ATP synthesis using a proton concentration gradient.
C) Under anaerobic conditions, NAD⁺ is regenerated for continued use in glycolysis by either lactic acid or alcoholic fermentation reactions.
D) ATP produced by exergonic reactions supplies the free energy needed to drive many endergonic reactions in the cell.
E) Anabolic and catabolic metabolic pathways are regulated, usually at the first committed step of each pathway.