DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.6b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.sl.TZ1.6b |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Deduce | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.sl.TZ1.6b
Insulin was the first protein to be sequenced. It was determined that the end of one chain had the primary structure Phe–Val–Asn–Gln.
(b)
Deduce the strongest intermolecular forces that would occur between the following amino acid residues in a protein chain.
[2]
Markscheme
Phenylalanine and valine:
London/dispersion/instantaneous induced dipole-induced dipole forces
OR
permanent dipole-induced dipole «interactions»
Glutamine and asparagine:
hydrogen bonds
Do not accept dipole-dipole interactions.
[2 marks]