Protein: Growth and repair, C, H, O, N sometimes S or P, Amino acids joined together by peptide bonds, Fish, eggs, nuts, Structural role: Keratin is found in skin and hair, Metabolic role: Enzymes to control reactions, Carohydrates: C, H, O in ratio Cx(H2O)y, Monosaccharides, disaccharides and polysaccharides, Bread, potatoes, jam, Structural role: Cellulose is used to form plant cell walls, Metabolic role: Glucose is broken down in respiration to release energy, Fats: C, H and O with no simple ratio, Triglyceride, Butter, oil, cream, fatty meat, Structural role: Form cell membranes,

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