DP Biology (first assessment 2025)

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Question 21M.2.SL.TZ2.2a.i

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.SL.TZ2.2a.i
Level SL Paper 2 Time zone TZ2
Command term Label Question number a.i Adapted from N/A
a.i.
[Maximum mark: 1]
21M.2.SL.TZ2.2a.i
(a.i)

On the diagrams, label with a letter H the hydrophilic end of a phospholipid.

[1]

Markscheme

hydrophilic end of phospholipid shown ✔

For 2a, i, ii and iii, accept letters written on the structure even if a line is not drawn.

Award the mark if the full word is used to label the structure. Labels must be unambiguous.

Examiners report

There were numerous examples of ambiguous labels, for example, an H without an arrow placed beside the membrane making it unclear whether the student was indicating the hydrophobic or hydrophilic part of the membrane.

Syllabus sections