AQA A Level Chemistry : Year 2 - Amino acids and Proteins with 100% correct answers

Give 4 roles of proteins Hormones Enzymes Structural components (e.g muscles) Antibodies What is the primary structure of a protein? The sequence of amino acids in the molecule 00:04 01:36 What is a protein? A sequence of amino acids joined by peptide links (bonds) What is the name of the bond between amino acids? Peptide bond How many naturally occurring amino acids are there? 20 What is the general structure of an amino acid? Central carbon group -COOH group -NH2 group -H -R group What is the only part of an amino acid that varies? -R group (side chain) What is the name of the linkage in a dipeptide? Peptide link (i.e. an amide group) What is a polymer of amino acids called? Polypeptide (polyamide) The melting points of amino acids are low True or False False They are very high! Are amino acids soluble in water and other polar solvents? Yes Are amino acids soluble in ether, benzene and other non-polar solvents? No Compare the acidity of amino acids and carboxylic acids Amino acids are less acidic than MOST carboxylic acids Compare the basicity of amino acids and amines Amino acids are less basic than MOST amines