Proteins 2.5 / 5 based on 2 ratings ? BiologyBiological molecules, organic chemistry and biochemistryASAQA Created by: Blackcurrant.Created on: 22-10-12 11:41 Which elements do proteins contain? Carbon, oxygen, hydrogen, nitrogeon (sulphur) 1 of 21 What is a monomer of a protein called? Amino acid 2 of 21 How many amino acids are there? 20 3 of 21 What is the bond between 2 amino acids called? Peptide bond 4 of 21 What are the properties of proteins? Crystalline, solid at room temp, soluble in water 5 of 21 What is the general formula of a protein? NH2.RCH.COOH 6 of 21 What does R represent? A variable group 7 of 21 What does the primary structure of a protein consist of? Number, type, sequence 8 of 21 How is the sequence decided? Coded for by DNA 9 of 21 What does the secondary structure consist of? Coiling or folding of one polypeptide chain into alpha helices of beta pleated sheets 10 of 21 How are alpha helices and beta pleated sheets held together? Hydrogen bonds between slightly positive amino group (NH2) and slightly negative carboxyl group (COOH) 11 of 21 What does the tertiary structure of a protein consist of? The folding and twisting of one polypeptide chain into a compact, globular shape 12 of 21 What soes the shape into which the polypeptide chain folds into depend on? Whether R groups attract or repel 13 of 21 What is hydrophobic interaction? The idea that hydrophilic R groups go on the outside and hydrophobic R groups go on the inside 14 of 21 How are the folds and twists held in place? Hydrogen bonds, ionic bonds and disulphide bridges 15 of 21 Where do disulphide bridges occur? Between cysteine molecules (only amino acid that contains sulphur) 16 of 21 What is meant by quaternery structure? When more than one polypeptide chain folds and twists together 17 of 21 What are the 2 types of protein? Fibrous and Globular 18 of 21 What are fibrous proteins? Structural proteins with little or no quaternery structure eg collagen 19 of 21 What are globular proteins? Metabolic proteins with complex quaternery structure, eg enzymes 20 of 21 What is the biochemical test for proteins? Biuret test - add Biuret A and Biuret B - if protein present turns purple 21 of 21
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