Quinn
Forum Elite
Topics: 63
Posts: 308
|
After a meal, blood glucose enters cells and is stored as glycogen, particularly in the liver. Which of the following is the donor of new glucose molecules in glycogen?
A. UDP-glucose-1-phosphate
B. UDP-glucose
C. UDP-glucose-6-phosphate
D. glucose-6-phosphate
E. glucose-1-phosphate
___________________
The universe will yield to the will of the determined person.
|
| mash
Forum Fanatic
Topics: 147
Posts: 1,326
|
its UDP glucose
___________________
I hear and I forget. I see and I remember. I do and I understand.
--Confucius
|
| Quinn
Forum Elite
Topics: 63
Posts: 308
|
that is what I thought....the answer given was "c"
doesn't make sense to me...explaination below:
Blood glucose is rapidly converted to glucose-6-phosphate upon entering cells by hexokinase or, in the case of the liver, by glucokinase. Glucose-6-phosphate is in equilibrium with glucose-1-phosphate via the action of phosphoglucomutase. Glucose-1-phosphate is activated by UTP to form UDP-glucose, which is added to glycogen by an -1,4 linkage in the presence of glycogen synthase. To increase the solubility of glycogen and to increase the number of terminal residues, glycogen-branching enzyme transfers a block of about 7 residues from a chain at least 11 residues long to a branch point at least 4 residues from the last branch point. The branch is attached by an -1,6 linkage.
still seems like UDP-glucose is the right answer
___________________
The universe will yield to the will of the determined person.
|
| mjl1717
Forum Hero
Topics: 959
Posts: 5,467
|
UDP- glucose
___________________
Smell the coffee! "Is That an Osler move??"
|
| Quinn
Forum Elite
Topics: 63
Posts: 308
|
I think we are right........most directly it is UDP-glucose. Besides G-6P converted to G 1-P, then linkage to UDP
___________________
The universe will yield to the will of the determined person.
|
|
| |
| | | | | |
