Adipocytes store fat in phospholipid-coated droplets in the cytosol. The protein perilipin is also associated with the surface of the lipid droplet. (a) Describe the likely structure of the perilipin protein. (b) Explain how phosphorylation of perilipin could help expose the lipids in the droplet to digestion by lipases.

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.