DP Chemistry (last assessment 2024)

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Question 23M.3.HL.TZ1.9

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Date May 2023 Marks available [Maximum mark: 2] Reference code 23M.3.HL.TZ1.9
Level HL Paper 3 Time zone TZ1
Command term Draw, State Question number 9 Adapted from N/A
9.
[Maximum mark: 2]
23M.3.HL.TZ1.9

DNA is an essential biological molecule.

(a)

State the three components of a monomer of DNA (a nucleotide).

[1]

Markscheme

phosphate AND deoxyribose AND nitrogenous base ✓


Accept named base.
Do not accept ‘sugar’ or ‘pentose sugar’ in place of deoxyribose.

(b)

Draw the hydrogen bonds between adenine and thymine.

[1]

Markscheme

Only 2 H bonds must be shown.

Accept H bond from either H in NH2 of Adenine, but not from both.

Accept solid lines instead of dashes.