Biology 1.3 Proteins 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryASWJEC Created by: DanCreated on: 04-01-14 17:44 What difference do proteins have in organic elements to lipids and carbohydrates? Proteins contain nitrogen as well as the other 3 elements. 1 of 19 What else can also be present? Sulphur and phosphorus 2 of 19 What are proteins built up of? From linear sequences of Amino acids (About 20 amino acids make up a protein) 3 of 19 State the basic structure of an amino acid -NH2 at one end of the amino acid and a -COOH group at the other as well as an R group 4 of 19 How do separate amino acids link? The amino group of one amino acid reacts with the carboxyl group of another with the elimination of water 5 of 19 What bond is formed and what product is produced? A peptide bond is formed and the resulting compound is a dipeptide 6 of 19 What is a polypeptide? A chain of many amino acids joined together 7 of 19 What is the primary structure of a protein? This is the sequence of amino acids in a polypeptide chain 8 of 19 Describe secondary structure Secondary structure is the shape that the polypeptide chain forms as a result of hydrogen bonding 9 of 19 What does this secondary structure form? Alpha helix (spiral) and Beta pleated sheet (wall) 10 of 19 What is the tertiary structure? When the secondary structure EG Alpha helix, can be folded and twisted to give a more complex, compact 3D structure 11 of 19 How is this new tertiary shape maintained? Its shape is maintained by disulphide, ionic and hydrogen bonds 12 of 19 What is Quaternary structure? A combination of 2 or more polypeptide chains in tertiary form 13 of 19 Describe a fibrous proteins structure A fibrous protein is made of 2 polypeptide bonds in parallel chains or sheets with numerous cross linkages to form fibres 14 of 19 Describe a globular proteins structure These proteins are compact and folded as spherical molecules 15 of 19 State some properties of fibrous proteins Insoluble in water, strong and tough 16 of 19 State some functions of globular proteins Enzymes, antibodies, plasma proteins and hormones 17 of 19 1 fibrous protein consists of... 3 polypeptide strands tightly wound around one and other 18 of 19 What is the name of the substance to test for proteins? Biuret reagent 19 of 19
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