Question

Which of the ten enzymes in glycolysis has a name that refers to the reverse reaction?

a. hexokinase
b. phosphoglycerate mutase
c. aldolase
d. phosphoglucose isomerase
e. glyceraldehyde-3-phosphate dehydrogenase
f. phosphofructokinase
g. enolase
h. pyruvate kinase
i. phosphoglycerate kinase
j. triosephosphate isomerase

Answer 1

H. Pyruvate Kinase

Step-by-step explanation:

Kinases are enzymes that catalyze the transfer of the terminal phosphoryl group of ATP to a substrate molecule. For example, in the hexokinase reaction of step 1 in glycolysis, a phosphoryl group is transferred from ATP to glucose to yield glucose-6-phosphate and ADP.

Thus, it should be expected that in the pyruvate kinase reaction, a phosphoryl group would be transferred from ATP to pyruvate. However, the reverse is really the case in the pyruvate kinase reaction of glycolysis.

In the pyruvate kinase reaction of glycolysis, a phosphoryl group is transferred from phosphoenolpyruvate to ADP to form ATP and pyruvate.