1) NH2 represents the ................group of an amino acid a) Carboxyl b) Amine c) Variable d) Glycerol e) Fatty acid f) Hydrogen 2) COOH represents the ................group of an amino acid a) Variable b) Amine c) R d) Fatty acid e) Carboxyl f) Glycerol 3) How many naturally occuring amino acids are there? a) 202 b) 222 c) 2 d) 200 e) 22 f) 20 4) What bond is formed when two amino acids join together? a) Disulfide b) Peptide c) Glycosidic d) Ester e) Hydrogen f) Covalent 5) Two amino acids joined together are known as a) Monosaccharides b) Disaccharides c) Polypeptide d) Dipeptide e) Triglyceride f) Phospholipid 6) What type of protein is a sequence of amino acids in a polypeptide chain a) Tertiary structure b) Quaternary  c) Secondary d) Primary structure 7) Tertiary proteins have a) Disulfide bridges b) Coiled amino acid chains c) Glycosidic bonds d) Ionic bonds e) Ester bonds f) Hydrogen bonds 8) What level of protein structure is shown by hydrogen bonding creating alpha helices/beta pleated sheets ? a) Tertiary structure b) Secondary c) Quaternary  d) Primary structure 9) Haemoglobin, insulin and collagen are examples of a) Tertiary proteins b) Secondary proteins c) Quaternary proteins d) Primary proteins e) Fibrous proteins f) Globular proteins

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