DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.1

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

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