Question 1

The key regulatory enzyme that primarily controls the rate of glycogen synthesis is

Accepted Answer

A)   glycogen synthase phosphorylase.
B)   glycogen synthase.
C)   glycogen synthase kinase.
D)   protein phosphatase-1.
E)   None of the answers is correct.F) C) and D)
G) B) and D)

Question 2

______________ markedly stimulates glycogen breakdown in muscle by initiating a cAMP signal-transduction cascade.

Accepted Answer

Epinephrin...

Question 3

In muscle,the first event in the breakdown of glycogen due to binding of a hormone is _____.

Accepted Answer

A)   cytoplasmic cAMP levels rise
B)   protein kinase A phosphorylates phosphorylase kinase
C)   adenylate cyclase is activated
D)   protein kinase A is activated
E)   activation of a G proteinF) B) and D)
G) D) and E)

Question 4

By what mechanism is phosphorylase kinase activated by Ca2+ levels of 1 μM?

Accepted Answer

The δ subunit of phosphorylase kinase is...

Question 5

Why must glycogen control be manifested differently in muscle and liver?

Accepted Answer

It is because the muscle maint...

Question 6

Which of the following occur after a carbohydrate-rich meal?

Accepted Answer

A)   Blood-glucose levels increase leading to glycogen storage in the liver.
B)   Blood-glucose levels increase leading to glycogen storage in the muscle.
C)   Glucose uptake from the blood increases as a result of the action of insulin.
D)   Glucagon is absent.
E)   All of the answers are correct.F) B) and C)
G) B) and D)

Question 7

The key enzyme in regulation of glycogen degradation is

Accepted Answer

A)   glycogen phosphatase.
B)   glycogen phosphorylase.
C)   glucose 1-phosphate synthase.
D)   glycogen kinase.
E)   None of the answers is correct.F) A) and E)
G) C) and D)

Question 8

Which of the following is a major site of glycogen storage?

Accepted Answer

A)   adipose tissue
B)   liver
C)   pancreas
D)   kidney
E)   All of the answers are correct.F) B) and C)
G) A) and B)

Question 9

Phosphorylase requires the coenzyme ______________________ for activity.

Accepted Answer

The answer of Phosphorylase requires the coenzyme ______________________ for activity....

Question 10

What physiological conditions render phosphorylase b less active?

Accepted Answer

A)   High ATP, AMP, and glucose 6-phosphate levels
B)   High ATP and low calcium ion levels
C)   High ATP and glucose 6-phosphate levels
D)   High AMP and low ATP levels
E)   None of the answers is correct.F) A) and D)
G) D) and E)

Exam 21: Glycogen Metabolism

Why must glycogen control be manifested differently in muscle and liver?

Correct Answer
verified
It is because the muscle maint...
View Answer

By what mechanism is phosphorylase kinase activated by Ca²⁺ levels of 1 μM?

Correct Answer
verified
The δ subunit of phosphorylase kinase is...
View Answer

Which of the following occur after a carbohydrate-rich meal?

Correct Answer
verified

The key enzyme in regulation of glycogen degradation is

Correct Answer
verified

______________ markedly stimulates glycogen breakdown in muscle by initiating a cAMP signal-transduction cascade.

Correct Answer
verified
Epinephrin...
View Answer

In muscle,the first event in the breakdown of glycogen due to binding of a hormone is _____.

Correct Answer
verified

The key regulatory enzyme that primarily controls the rate of glycogen synthesis is

Correct Answer
verified

What physiological conditions render phosphorylase b less active?

Correct Answer
verified

Which of the following is a major site of glycogen storage?

Correct Answer
verified

Phosphorylase requires the coenzyme ______________________ for activity.

Correct Answer
verified

Exam 21: Glycogen Metabolism

Why must glycogen control be manifested differently in muscle and liver?

Correct AnswerverifiedIt is because the muscle maint...View AnswerShow Answer

By what mechanism is phosphorylase kinase activated by Ca2+ levels of 1 μM?

Correct AnswerverifiedThe δ subunit of phosphorylase kinase is...View AnswerShow Answer

Which of the following occur after a carbohydrate-rich meal?

Correct AnswerverifiedShow Answer

The key enzyme in regulation of glycogen degradation is

Correct AnswerverifiedShow Answer

______________ markedly stimulates glycogen breakdown in muscle by initiating a cAMP signal-transduction cascade.

Correct AnswerverifiedEpinephrin...View AnswerShow Answer

In muscle,the first event in the breakdown of glycogen due to binding of a hormone is _____.

Correct AnswerverifiedShow Answer

The key regulatory enzyme that primarily controls the rate of glycogen synthesis is

Correct AnswerverifiedShow Answer

What physiological conditions render phosphorylase b less active?

Correct AnswerverifiedShow Answer

Which of the following is a major site of glycogen storage?

Correct AnswerverifiedShow Answer

Phosphorylase requires the coenzyme ______________________ for activity.

Correct AnswerverifiedShow Answer

Correct Answer
verified
It is because the muscle maint...
View Answer

By what mechanism is phosphorylase kinase activated by Ca²⁺ levels of 1 μM?

Correct Answer
verified
The δ subunit of phosphorylase kinase is...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Epinephrin...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified