DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.9a
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ1.9a |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Draw, State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
19M.3.hl.TZ1.9a
Aspartame is a derivative of a dipeptide formed between two amino acids, phenylalanine (Phe) and aspartic acid (Asp).
(a)
Draw a circle around the functional group formed between the amino acids and state its name.
Name:
[2]
Markscheme
Name:
amide/amido/carboxamide [✔]
Note: Accept “peptide bond/linkage”.
Examiners report
Candidates were challenged to draw a circle around the functional group formed between the two amino acids in a dipeptide. Commonly the central C=O or the N-H groups were circled instead of the amide. Some candidates then named the functional group as a ketone or amine, however most candidates stated “peptide” here and scored a mark.
