DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.5b

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.2.SL.TZ2.5b
Level SL Paper 2 Time zone TZ2
Command term Draw Question number b Adapted from N/A
b.
[Maximum mark: 3]
19M.2.SL.TZ2.5b
(b)

Draw the structure of a dipeptide.

[3]

Markscheme

a. two amino acids, one with NH2/NH3+end and one with COOH/COO– end ✔

b. peptide bond between C=0 and N—H correctly drawn ✔

c. «chiral» C with H and R group on each amino acid ✔

d. peptide bond labelled/clearly indicated between C terminal of one amino acid and N terminal of the second amino acid ✔

Labels not required for amino group and carboxyl group.

Examiners report

Structure of the dipeptide – candidates who also do chemistry were at an advantage here. Diagrams went from the superb to something Picasso might have produced.

Syllabus sections