MCB 2000 - EXAM 6 Final Test
Questions and All Correct Answers
2025-2026 Updated.
What is glycogen? - Answer Highly branched glucose polymer
Stored in liver and muscle
How are glucose molecules linked in Glycogen? - Answer alpha 1,4 glycosidic linkage within
the same branch
alpha 1,6 glycosidic linkage across branches (branching point)
What are the ends of glycolysis branches called?
How many are there? - Answer Nonreducing ends
A ton, lots of possible targets for enzymes
What are the four enzymes that degrade glycogen? - Answer Glycogen phosphorylase
Transferase
a-1,6-Glucosidase
Phosphoglucomutase
What does glycogen phosphorylase do? - Answer Targets nonreducing end of glycolysis
Breaks a glycosidic bond and phosphorylates turning the end into Glucose-1-phosphate
What does transferase do? - Answer After all possible glucose phosphorylase is done it
changes the branching to make more glucoses available for a-1,6 glucosidase?
Why can't glycogen phosphorylase do the whole job? - Answer It can't cleave near branch
points and can only cleave 1,4-glycosidic bonds
, LEAVES GLUCOSE NOT GLUCOSE-1 PHOSPHATE
What is the ratio of 1-4 linkages to 1-6 linkages? - Answer 12 1-4 : 1 1-6
What is the ratio of glucose 1-phosphate to glucose? - Answer 12:1
What does phosphoglucomutase do?
What is the important carrier here?
Does it move phosphates or exchange it? - Answer Turns glucose 1-phosphate to glucose 6-
phosphate
Serine 114
Exchange
What does glucose-6-phosphatase do?
Where is it located? - Answer Dephosphorylates to regular old glucose
Located only in the liver
What is the key regulatory enzyme for glycogen breakdown? - Answer Glycogen
phosphorylase
What are the two forms of glycogen phosporylase?
What are the two states?
How does it come? - Answer A form - activated and has Serine-14 residues
B form - less active, no serine
R state favored by A
T state favored by B
Questions and All Correct Answers
2025-2026 Updated.
What is glycogen? - Answer Highly branched glucose polymer
Stored in liver and muscle
How are glucose molecules linked in Glycogen? - Answer alpha 1,4 glycosidic linkage within
the same branch
alpha 1,6 glycosidic linkage across branches (branching point)
What are the ends of glycolysis branches called?
How many are there? - Answer Nonreducing ends
A ton, lots of possible targets for enzymes
What are the four enzymes that degrade glycogen? - Answer Glycogen phosphorylase
Transferase
a-1,6-Glucosidase
Phosphoglucomutase
What does glycogen phosphorylase do? - Answer Targets nonreducing end of glycolysis
Breaks a glycosidic bond and phosphorylates turning the end into Glucose-1-phosphate
What does transferase do? - Answer After all possible glucose phosphorylase is done it
changes the branching to make more glucoses available for a-1,6 glucosidase?
Why can't glycogen phosphorylase do the whole job? - Answer It can't cleave near branch
points and can only cleave 1,4-glycosidic bonds
, LEAVES GLUCOSE NOT GLUCOSE-1 PHOSPHATE
What is the ratio of 1-4 linkages to 1-6 linkages? - Answer 12 1-4 : 1 1-6
What is the ratio of glucose 1-phosphate to glucose? - Answer 12:1
What does phosphoglucomutase do?
What is the important carrier here?
Does it move phosphates or exchange it? - Answer Turns glucose 1-phosphate to glucose 6-
phosphate
Serine 114
Exchange
What does glucose-6-phosphatase do?
Where is it located? - Answer Dephosphorylates to regular old glucose
Located only in the liver
What is the key regulatory enzyme for glycogen breakdown? - Answer Glycogen
phosphorylase
What are the two forms of glycogen phosporylase?
What are the two states?
How does it come? - Answer A form - activated and has Serine-14 residues
B form - less active, no serine
R state favored by A
T state favored by B
