Question

The synthesis of new glycogen molecules are initiated by the homodimeric protein, _________, that catalyzes the addition of 8 glucose molecules to a tyronyl residue in the protein. Thus, glycogen molecules are actually a type of glycosylated protein
a) Glucogenin
b) Glycogenin
c) Amylogenin
d) Glycogen synthase
e) Branching enzyme

Answer 1

Answer:

b) Glycogenin

Explanation:

Glycogenin

Glycogenin is a small pre - existing fragment glycogen , that acts as a primer or gycogenin to start the process of glycogen synthesis .  

The Glycogenin accept the glucose from the UDP -Glc .

The Glycogenin has a tyrosine amino acid group , which have a hydroxyl group , on which the glucose unit is attached .  

The first molecules of Glucose to Glycogenin is transfered by the nezyme Glycogen initiator synthase .

Then ,  

The Glycogenin take the remaining residue of glucose to form a primer fragment which acts as a the acceptor of the remaining glucose molecules  .