DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.9b
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ1.9b |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Deduce | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19M.3.hl.TZ1.9b
Aspartame is a derivative of a dipeptide formed between two amino acids, phenylalanine (Phe) and aspartic acid (Asp).
(b)
A mixture of phenylalanine and aspartic acid is separated by gel electrophoresis with a buffer of pH = 5.5.
Deduce their relative positions after electrophoresis, annotating them on the diagram. Use section 33 of the data booklet.
[2]
Markscheme
Phe: must be on the origin [✔]
Asp: any position on the left/anode/+ side [✔]
Examiners report
Most candidates correctly deduced the positions of the two amino acids after electrophoresis.
