Which of the following types of enzymes are NOT used for UDP-Glc synthesis?Group of answer choicesa kinasea phosphorylasean isomerasea dehydrogenase

To determine which type of enzyme is NOT involved in the synthesis of UDP-Glucose (UDP-Glc), we can analyze the functions of the provided enzyme types.

1. Kinase: This type of enzyme transfers a phosphate group from ATP to a substrate, which is a crucial step in many metabolic pathways, including the phosphorylation of glucose to glucose-6-phosphate, which is a precursor for UDP-Glc synthesis.

2. Phosphorylase: This enzyme catalyzes the addition of inorganic phosphate to a substrate, typically breaking down glycogen or starch. While phosphorylases play roles in carbohydrate metabolism, they do not directly synthesize UDP-Glc.

3. Isomerase: Isomerases catalyze the rearrangement of atoms within a molecule. For instance, glucose-6-phosphate can be converted to glucose-1-phosphate by the action of phosphoglucomutase, which is a type of isomerase and is involved in the pathway leading to UDP-Glc synthesis.

4. Dehydrogenase: This enzyme aids in the oxidation-reduction reactions by removing hydrogen from a substrate. In the context of carbohydrate metabolism, dehydrogenases play roles in converting precursors that can be used in UDP-Glc synthesis.

Conclusion

In this analysis, the enzyme type that is NOT directly involved in the synthesis of UDP-Glc is the phosphorylase. Therefore, the answer is:

Final Answer: a phosphorylase