Exam 4

Question 1

Glycogen phosphorylase degrades glycogen from which ends?

Answer 1

Nonreducing ends

Glycogen phosphorylase is an enzyme that plays a crucial role in glycogen metabolism.

Question 2

Phosphorylase can only remove the non-reducing end glucose with an α1-4 glycosidic bond and releases what?

Answer 2

Glucose 1-phosphate

This process is essential for mobilizing glucose from glycogen stores.

Question 3

What is glucose 1-phosphate converted into by phosphoglucomutase?

Answer 3

Glucose 6-phosphate

This conversion is a key step in glucose metabolism.

Question 4

What can glycogen phosphorylase NOT do?

Answer 4

Cleave near branch points and stop four sugars away from the branching point

This limitation affects the enzyme’s ability to fully degrade glycogen.

Question 5

What enzyme converts glucose 1-phosphate to glucose 6-phosphate?

Answer 5

Phosphoglucomutase

This reaction involves a glucose 1, 6-bisphosphate intermediate.