Quelpr
3 marksMacromolecules

CAPE Chemistry Unit 2 · 2009 · Paper 2 · Question 4(b)(ii)

Polymerisation of amino acids.

Write the equation, using displayed formulae, to show the formation of the dipeptide molecule AND circle the peptide link.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 4(a)(i)a)Define 'Stereoisomerism'.[1 mark]
  2. 4(a)(i)b)Define 'Chiral centre'.[1 mark]
  3. 4(a)(ii)Copy the displayed formula of alanine in your answer booklet. Place an asterisk (*) to identify the chiral centre AND state the type of isomerism exhibited.[2 marks]
  4. 4(a)(iii)Write the displayed formulae of the two isomers of alanine.[2 marks]
  5. 4(a)(iv)Write the displayed formula of the species present in aqueous solutions of alanine at: a) pH = 2, b) pH = 13, c) pH = 7.[4 marks]
  6. 4(b)(i)State the type of polymerisation involved in the formation of a dipeptide molecule.[1 mark]
  7. 4(b)(iii)Name the functional group represented by the peptide link.[1 mark]

More practice: the rest of this paper · more Macromolecules questions · all CAPE Chemistry Unit 2 past papers