Carbohydrates: Simplest unit are monosaccharides, Primary energy source for the body, E.g. glucose, Lipids: Simplest unit is a molecule of fatty acid and glycerol, Can be used to store energy as fat, E.g. fats and oils, Proteins: Simplest units are amino acids, Act as enzymes to speed up chemical reactions, E.g. lipase and protease, Nucleic Acids: Simplest unit are nucleotides, Contain the codes that determine which proteins will be made by the cell, e.g. DNA, Vitamins: Act as co-enzymes for many chemical reactions, e.g. vitamin A, Minerals: May be part of enzymes of make up parts of substances, e.g. calcium,

Nutrients

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