Which statements are true of glycogen synthesis and breakdown (select all that apply)? O Under normal circumstances, glycogen synthesis and glycogen breakdown occur simultaneously and at high rates. O Synthesis is catalyzed by a different enzyme from the one that catalyzes breakdown. O The glycogen molecule "grows" at its reducing end. O Phosphorylation activates the enzyme responsible for breakdown, and inactivates the synthetic enzyme. O The immediate product of glycogen breakdown is free glucose.

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