DP Chemistry (last assessment 2024)
Question 18M.3.sl.TZ1.c.ii
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.sl.TZ1.c.ii |
| Level | sl | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | c.ii | Adapted from | N/A |
c.ii.
[Maximum mark: 1]
18M.3.sl.TZ1.c.ii
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.
Paper chromatography can be used to identify the amino acids in insulin.
Outline how the amino acids may be identified from a paper chromatogram.
[1]
Markscheme
compare Rf with known amino acids
OR
compare distance moved with known amino acids
Accept “from Rf”.
[1 mark]
