Final answer:
Mutases are enzymes that catalyze the rearrangement of a chemical group within a molecule, aiding in carbohydrate metabolism by transferring a functional group to a different position within the same molecule.
Step-by-step explanation:
The correct answer to this question is (b) An enzyme that catalyzes a change in the position of a specific chemical group within a single molecule. Mutases are a type of isomerase enzyme, and one of their roles in carbohydrate metabolism is to catalyze the transfer of a functional group, like a phosphate, within a molecule from one position to another. This rearrangement is important for the regulation and progression of metabolic pathways, for example, in the conversion of 3-phosphoglycerate to 2-phosphoglycerate in the glycolysis pathway.