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GCSE Combined Science · key term
A biological polymer made from a long chain of amino acids.
Used by OCR
Specification B1.3e · Biology Paper 1
Revise: Amino Acids and Protein MetabolismProteins are biological molecules needed for growth and repair. They also have many specific jobs: enzymes are proteins, as are haemoglobin and keratin. Making proteins is therefore essential for cells to function.
Biology, Combined Science
A large biological molecule made from a chain of amino acids. Proteins have functions including growth, repair and enzyme action.
Use the terms precisely: amino acids are the monomers; proteins are the polymers.
For an explanation, link both directions: proteins are broken down into amino acids, which can then be joined to synthesise new proteins.
Link each substance taken into an organism to its use: for example, nitrate ions supply nitrogen for making amino acids and proteins.
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Three important groups are carbohydrates, lipids and proteins. Organisms need these molecules both as sources of fuel and as materials for building cells.
