February/March 2026 Paper 42

2026 · 6 questions · 51 parts · 80 marks

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Context for question 6
Polyamides are condensation polymers. Proteins are natural polyamides formed from amino acid monomers.
Figure 6.1 shows part of the structure of a protein.
Figure 6.1: part of a protein chain drawn as displayed formulae, with -N(H)-C(=O)- amide links and three side-chain boxes, two white and one shaded, standing for the monomer residues
6(a)Amino Acids Proteins EnzymesEasy1 mark
Deduce the number of different types of amino acid monomers needed to make the part of the protein shown in Figure 6.1.
6(b)Condensation PolymersEasy1 mark
Deduce the number of water molecules produced when the part of the protein shown in Figure 6.1 forms from amino acid monomers.
6(c)Amino Acids Proteins EnzymesMedium3 marks
Complete Figure 6.2 to show the general structure of an amino acid monomer.
R represents a side-chain.
Show all of the atoms and all of the bonds.
Diagram to annotate
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Draw with the mouse or a finger.
6(d)
Figure 6.3 shows part of the structure of a different polymer.
Figure 6.3: part of a different polyamide drawn as displayed formulae, with C=O groups and N-H amide links joining alternating shaded and white residue boxes
6(d)(i)Condensation PolymersEasy1 mark
Deduce the number of repeat units shown in Figure 6.3.
6(d)(ii)Condensation PolymersEasy2 marks
Name the two types of organic compounds needed to make the polymer shown in Figure 6.3.

Two answers required.