Question

The first energy-generating steps in glycolysis begin when glyceraldehyde 3-phosphate undergoes an energetically favorable reaction in which it is simultaneously oxidized and phosphorylated by the enzyme glyceraldehyde 3-phosphate dehydrogenase to form 1,3-bisphosphoglycerate, with the accompanying conversion of NAD+ to NADH. In a second energetically favorable reaction catalyzed by a second enzyme, the 1,3-bisphosphoglycerate is then converted to 3-phosphoglycerate, with the accompanying conversion of ADP to ATP. Which of the following statements is TRUE about this reaction?

a. The cysteine side chain on the enzyme is oxidized by NAD+.
b. The energy stored in the phosphate bond of glyceraldehyde 3-phosphate contributes to driving the reaction forward.
c. The ΔG° for the oxidation of the aldehyde group on glyceraldehyde 3-phosphate to form a carboxylic acid is more negative than the ΔG° for ATP hydrolysis.
d. The reaction glyceraldehyde 3-phosphate---->1,3-bisphosphoglycerate should be inhibited when levels of NADH fall.

Answer 1

The answer is option B.

Step-by-step explanation:

It is stated that "the enzyme glyceraldehyde 3-phosphate dehydrogenase to form 1,3-bisphosphoglycerate" which indicates that the energy from the broken bonds of the glyceraldehyde 3-phosphate provides energy for the reaction to take place.

So the correct answer is option B.

I hope this helps.