1. Starting from a glucose residue in glycogen, how many net ATP molecules will
ID: 149849 • Letter: 1
Question
1. Starting from a glucose residue in glycogen, how many net ATP molecules will be formed in the glycolysis of the residue to pyruvate? (b) 2 (d) 4 2. Glucose is synthesized into glycogen as a way of storing metabolic energy, and its degradation glycogenolysis) is the manner in which this energy is released for use (a) What would be the effect on these processes under conditions of fasting or exercise? Glycogen synthesis Glycogenolysis increased decreased unchanged unchanged increased decreased (b) What would be the effect on these processes immediately following a meal or at rest? Glycogen synthesis increased decreased unchanged unchanged Glycogenolysis increased decreased 3. Glycogen synthesis and degradation is reciprocally regulated by phosphorylation and dephosphorylation. Glycogen phosphorylase activity is increased by addition of a phosphate and decreased by its removal; in contrast, glycogen synthase activity is decreased on addition of a phosphate and increased by its removal What is the name of an enzyme that adds a phosphate to a protein? What is the name of an enzyme that removes a phosphate from a protein? Which enzyme would be most active under conditions of fasting or exercise? a. b. C. Glycogen phosphorylase Glycogen synthase d. Which enzyme would be most active immediately following a meal or at rest? Glycogen phosphorylase Glycogen synthase e. What would be the level of the phosphorylated enzyme under conditions of fasting or exercise? Glycogen phosphorylase: low highno effect Glycogen synthase low high no effect f. What would be the level of the phosphorylated enzyme immediately following a meal or at rest? Glycogen phosphorylase: low highno effect Glycogen synthase low high no effectExplanation / Answer
1.) (b) 2 ATP Molecules
2.) (a) Glycogen synthesis decreased during fasting or exercise as glucose is used during this process and not formed.
Glycogenolysis is increased during fasting or exercise as glucose is used for bodily functions and breakdown of glycogen to glucose is needed.
(b) Glycogen synthesis is increased after meal or at rest as rise in glucose level occurs after meal.
Glycogenolysis decreased after meal ar at rest as glucose level rises so no need of breaking glycogen.
3.) (a) Kinase
(b) Phosphatase
(c) Glycogen phosphorylase
(d) Glycogen synthase
(e) Glycogen phosphorylase: high
Glycogen synthase: low
(f) Glycogen phosphorylase : low
Glycogen synthase : high
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