Two ATP molecules are expended in the energy investment phase of glycolysis.Why is this energy needed to begin the process of glucose catabolism?
A)It is needed because glycolysis is considered an exergonic process which always requires input of energy from ATP.
B)It is needed to generate the electron carrier NAD⁺.
C)It is needed to induce the enzymes of glycolysis.
D)Some energy must be invested to make the glucose molecule unstable and begin the process of catabolism.

Question

Quizplus · Accepted Answer

Some energy must be invested in order to break the stable glucose molecule into two molecules of glyceraldehyde-3-phosphate, which can then be converted into pyruvate and ultimately generate ATP. This initial investment of energy is necessary for the process of glycolysis to proceed.

Two ATP Molecules Are Expended in the Energy Investment Phase