DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ1.25

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ1.25
Level SL Paper 1A Time zone TZ1
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
23M.1A.SL.TZ1.25

The image of the X-ray diffraction of calf thymus DNA was obtained by R. Franklin and R. Gosling in 1953.

[Source: Franklin, R.E. and Gosling, R.G., 1953. [image online]
Available at: https://scripts.iucr.org/cgi-bin/paper?a00979.
[Accessed 8 March 2022].]

What does this image show about the structure of DNA?

A.  It is associated with histones.

B.  It has a helical shape.

C.  It contains deoxyribose.

D.  It contains four nitrogenous bases.

 

[1]

Markscheme

B

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