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) A Biuret test involves..... a) Adding sodium hydroxide, then copper sulfate solution b) Adding iodine solution c) Shaking with ethanol d) A positive result being red e) A negative result being blue f) A positive result being purple 7) What type of protein is a sequence of amino acids in a polypeptide chain a) Tertiary structure b) Quaternary  c) Secondary d) Primary structure 8) Tertiary proteins have a) Disulfide bridges b) Coiled amino acid chains c) Glycosidic bonds d) Ionic bonds e) Ester bonds f) Hydrogen bonds 9) What type of protein involves chains formed by hydrogen bonding a) Tertiary structure b) Secondary c) Quaternary  d) Primary structure 10) 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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