BIOMG 3300 Unit 13 Questions with Complete Solutions

reaction catalyzed by glycogen phosphorylase, know structures Correct Answer-a1->4 glycosidic linkage between glucose residues at a nonreducing end of glycogen is cleaved by Pi--> shortens chain by one glucose (n)glucose--> (n-1)glucose + glucose-1-phosphate What is an example of a phosphorolysis reaction? Why is phosphorolysis is more energetically efficient than hydrolysis? Correct Answer-Ex: glycogen phosphorylase shortening a glycogen chain In phosphorolysis some of the energy of the glycosidic bond is preserved in the formation of the phosphate ester, glucose 1-phosphate. give 4 reasons why sugar nucleotides are suitable substrates for biosynthetic reactions Correct Answer-(1)Irreversible formation contributing to the irreversibility of the synthetic pathways in which they are intermediates (due to highly exergonic PPi formation) (2) Nucleotides have many groups that can undergo noncovalent interactions with enzymes, this additional free energy of binding can increase catalytic activity