DP Biology (last assessment 2024)

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Question 23M.1.HL.TZ1.1

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1.HL.TZ1.1
Level HL Paper 1 Time zone TZ1
Command term Question number 1 Adapted from N/A
1.
[Maximum mark: 1]
23M.1.HL.TZ1.1

The micrograph shows two types of blood cell.

What determines the differences between the two types of cell?


A.  Different number of mitotic cycles

B.  Different expression of some genes

C.  Reaction to oxygen of red blood cells

D.  Reaction to antigens of white blood cells

[1]

Markscheme

B

Examiners report

SL:

This question attracted criticism from some teachers who thought that the micrograph was out of focus, but candidates only had to identify red and white blood cells. Often the first question on Paper 1 is intended to be easy to help candidates settle in to the exam. This starter question was harder than most and only about 40% of candidates chose differences in gene expression as the reason for blood cells developing differently.

Syllabus sections