Carbohydrate
The hormones, glucagon and epinephrine, stimulate glycogen breakdown to G-6-P

only in the liver
directly, by binding to glycogen phosphorylase
using ATP as the phosphoryl donor
indirectly, by first stimulating adenylate cyclase to make cAMP

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Carbohydrate
The multistep pathways of metabolism are efficient because they

use the same enzyme for all of the substrates in the pathway
use the same substrate for all of the enzymes in the pathway
spread the enzymes for a pathway into several different organelles
locate all of the enzymes for a pathway in the same place within the cell

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