Concept:Tertiary structures define complex, soluble globular proteins (hormones, enzymes, antibodies), while secondary structures define tough, insoluble fibrous proteins.
Solution:- Hormones (like insulin or glucagon) are chemical messengers secreted by glands.
- To travel through the aqueous bloodstream and perfectly dock into complex, 3D cellular receptors, they must be highly soluble, specifically folded globular proteins with intricate tertiary structures.
- Therefore, Carrying messages from glands to target organs is a direct function relying on tertiary structural folding.
Why other options are incorrect:- Skin lining (Keratin), Connective matrix (Collagen), Muscle contraction (Actin/Myosin): These are all classic examples of tough, long, insoluble fibrous proteins. Their functions rely strictly on highly repetitive Secondary structures forming long strands, rather than 3D tertiary globes.
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