DP Biology (first assessment 2025)
Question 21N.2.HL.TZ0.4a
| Date | November 2021 | Marks available | [Maximum mark: 1] | Reference code | 21N.2.HL.TZ0.4a |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Label | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
21N.2.HL.TZ0.4a
(a)
The figure shows a tripeptide.
Label one peptide bond in this molecule.
[1]
Markscheme
circle/bracket around peptide bond / arrow pointing to peptide bond / peptide bond labelled;
Allow either peptide bond
Allow if adjacent C=O and NH groups are included in the circle/bracket, but do not allow if other parts of the molecule are included.
Examiners report
80 % of candidates indicated one of the two peptide bonds in the diagram correctly.
