AQA Jun 2016 Paper 4 Q5

Answers available below

do not write outside the box proteins contain sequences of amino acids joined by peptide links amino acid chains polypeptides are attracted to each other by hydrogen bonding a i a section of a protein is formed from one molecule of each of the amino acids glycine h nch cooh and alanine h nch ch cooh add bonds and atoms to the diagram to complete a structural formula for this section of the protein marks a ii draw a diagram to show how an amino acid chain can form a hydrogen bond with another amino acid chain your diagram need only show the relevant atoms from one amino acid in each chain mark wmp jun chem do not write outside the box b leucine serine and glutamic acid are naturally occurring amino acids ch chch nh cooh hoch nh cooh hooc ch nh cooh leucine serine glutamic acid b i give the iupac name of leucine mark b ii draw the structure of the zwitterion of serine b iii draw the structure of the ester formed by two molecules of serine b iv draw the structure of the species formed by glutamic acid at low ph mark mark mark turn over wmp jun chem

Show answer