[sinthreck]

When glycogen rather than glucose is the starting point of glycolysis
a) the yield of ATP per molecule of glucose increases from two to four
b) the yield of ATP per molecule of glucose decreases from two to one
c) a step in glycolysis involving glucose 1-phosphate is bypassed
* d) substrate-level phosphorylation is involved in the first step

I disagree with the given answer. The first 2 steps of Glycogenolysis involve:

1) Glycogen  Glucose-1-phosphate (phosphorylase)
2) G-1-P  Glucose-6-phosphate (phosphoglucomutase)

Now G-6-P is an intermediate in glycolysis so the process will continue as normal. The net result should be 1 more ATP because you didn't have to use hexo/gluco kinase.

Is there any correct answer above?