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Question 18M.2.SL.TZ2.2b.i

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.2.SL.TZ2.2b.i
Level SL Paper 2 Time zone TZ2
Command term Explain Question number b.i Adapted from N/A
b.i.
[Maximum mark: 2]
18M.2.SL.TZ2.2b.i
(b.i)

Explain how model making helped Watson and Crick to establish the structure of DNA.

[2]

Markscheme

a. decided to combine what was known about chemical content of DNA with information from X-ray diffraction studies OWTTE.

b. built scale models of components of DNA 

c. then attempted to fit them together in a way that agreed with the data «from separate sources» 

d. made several arrangements of scale model until found best one that fitted all the data

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