DP Biology (first assessment 2025)

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Question 19M.2.SL.TZ2.2a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.SL.TZ2.2a
Level SL Paper 2 Time zone TZ2
Command term Estimate Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.2.SL.TZ2.2a
(a)

Estimate the length of the molecule of DNA shown in the autoradiogram between the two arrows.

……………...mm

 

[1]

Markscheme

0.45 «mm» ✔

Allow values between 0.35 «mm» and 0.50 «mm»

Examiners report

This question concerned Cairns’ technique to measure the length of a section of DNA. Most candidates could estimate the length of DNA shown in the diagram.

Syllabus sections