DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.6a

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.SL.TZ0.6a
Level SL Paper 2 Time zone TZ0
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 3]
20N.2.SL.TZ0.6a
(a)

Draw a molecular diagram to show the formation of a peptide bond.

[3]

Markscheme

a. two amino acids correctly drawn;

b. removal/production of H2O molecule shown;

c. peptide bond labelled between C of C=O and N of N-H;

Accept specific examples of amino acids correctly drawn for example glycine with H instead of R.

mpc can be awarded if the peptide bond is shown as in the dipeptide diagram but there are errors elsewhere.

Examiners report

Mostly full marks were gained although some had the correct diagrams but failed to label the peptide bond.

Syllabus sections