Exercise on Glycogen Metabolism Key
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1. a. 32,000 ATP;
b. 32,000 ATP take up much more volume than 1,000 glucose molecules.
c. 32,000 ATP = 32,000 particles, while 1 glycogen molecule = 1 particle, and
            osmolarity is a function of the number of particles on each side of a membrane.

2. a. the reducing end; b. ATP; c. Because it is required before the pathway begins;
d. inorganic phosphate; e. nothing

3. a-d.



e. glucose-6-phosphate ↔ (glucose-1,6-bis-phosphate) ↔ glucose-1-phosphate → UDP-glucose → glycogen

4. a-b. Locate the circled parts of the glycogen molecule.

c.

5. a-b. Locate the circled parts of the glycogen molecule.


b1 indicates the fist part of the reaction catalyzed by the debranching enzyme.

c. Two products are shown below. The first is an intermediate, in which one glucose residue with an α-(1→6) bond is still attached to the main chain.
The second product shows the chain after hydrolysis of the α-(1→6) bond.
Note that for both products, the non-reducing end of the long chain isn't shown; the chain is now too long for a diagram to fit onto the page because 3 more residues have been added.

 

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