Which biomolecule acts as the primary energy storage in animals?
Glycogen
All four options are carbohydrates, but they play different roles:
Glycogen — a highly branched polymer of glucose, stored in the liver and skeletal muscles of animals. It is the principal short-term energy reserve in animals.
Starch — the energy storage molecule in plants, not animals.
Cellulose — a structural polysaccharide forming plant cell walls; not an energy store.
Sucrose — a disaccharide (table sugar), used for transport in plants, not for storage.
Hence the answer is Glycogen.
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