Question

Glycogen is a highly branched starch where the branches are connected through a-1,6 linkages. During glycogen degradation, these branches are processed through a 2-step process where 3 glycogen residues are transferred to the end of another strand and the a- 1,6 linkage is cleaved by an a-1,6 glucosidase, also known as the debranching enzyme, to produce ______
a) glucose 1-phosphate
b) glucose 6-phosphate
c) glucose
d) maltose
e) sucrose

Answer 1

Answer:

a) glucose 1-phosphate

Explanation:

   

Glycogen is a highly branched polysaccharide of glucose . During breakdown of glycogen or glycogenolysis , glycogen phosphorylase starts removing glucose units having alpha -1,4 linkage from non-reducing end one by one and produces glucose-1-phosphate until 4 glucose residues ahead of alpha -1,6 linkage. Next de -branching enzyme transfer 3 glucose units to some outer chain and then breaks alpha -1,6 linkage . The glucose-1-phosphate then converts into glucose-6-phosphate by phosphoglucomutase and undergoes glycolysis .