21. Fructose-2,6-bisphosphate

A. activates fructose-1,6-bisphosphatase
B. activates phosphofructokinase
C. inhibits fructose-1,6-bisphosphatase
D. both (b) and (c)

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22. Glucose from the breakdown of glycogen is obtained in

A. the liver by phosphorolysis
B. the muscles by phosphorolysis
C. the muscles by hydrolysis
D. both (a) and (b)

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23. Glycogen has

A. α-1,4 linkage
B. α-1,6 linkages
C. α-1,4 and α-1,6 linkages
D. α-1,4 and β-1,6 linkage

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