BIOLOGY
DISACCHARIDES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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breaks off 2 glucoses at a time for glycolysis
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breaks off 1 glucose at a time for glycolysis
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breaks off glucoses from glycogen found anywhere BUT the liver and muscles
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None of the above
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Detailed explanation-1: -In the cytosol, glycogen breakdown or glycogenolysis is carried out by two enzymes, glycogen phosphorylase which releases glucose 1-phosphate from the linear chains of glycogen, and glycogen debranching enzyme which untangles the branch points. In the lysosomes, glycogen degradation is catalyzed by -glucosidase.
Detailed explanation-2: -Glycogen phosphorylase catalyzes the sequential phosphorolysis of glycogen to release glucose-1-phosphate; it is thus the key enzyme in the utilization of muscle and liver reserves of glycogen.
Detailed explanation-3: -Glycogen Phosphorylase catalyzes breakdown of glycogen into Glucose-1-Phosphate (G1P). The reaction (see HERE) that produces G1P from glycogen is a phosphorolysis, not a hydrolysis reaction.
Detailed explanation-4: -The Role of PYGM in Physiology. Muscle glycogen phosphorylase catalyzes the first step of glycogenolysis to meet the energy requirements for muscle activity. At the resting state, the inactive enzyme can be activated by AMP or inosine 5′-monophosphate (IMP), and is inhibited by ATP, G1P, and other metabolites.
Detailed explanation-5: -Glycogen Phosphorylase, the Product of the glgP Gene, Catalyzes Glycogen Breakdown by Removing Glucose Units from the Nonreducing Ends in Escherichia coli.