What is a protein and how is its structure adapted to its function?

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3. (a) What is a protein?
A protein is a complex organic macromolecule composed of one or more long chains of amino acids. These amino acid chains are folded into specific three-dimensional structures, which determine their biological function. Proteins are essential for virtually every process within living cells.

3. (b) How is the structure of the protein adapted to its function?
The specific three-dimensional structure of a protein is crucial for its function. This structure, determined by the sequence of amino acids (primary structure) and subsequent folding (secondary, tertiary, and sometimes quaternary structures), creates a unique shape with specific binding sites or catalytic regions. For example, enzymes have an *active site