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Question 19M.3.SL.TZ2.a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.SL.TZ2.a
Level SL Paper 3 Time zone TZ2
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.3.SL.TZ2.a

Two models of plasma membrane structure are shown.

[Source: diagram from article published in The American Journal of Pathology, 65, J Singer and G Nicolson,
The structure and chemistry of mammalian cell membranes, 427–437, Copyright Elsevier (1971)]

State the scientists who proposed model A.

[1]

Markscheme

Davson–Danielli ✔

Examiners report

There were a variety of suggestions for the names of the scientists with Singer and Nicolson, as given in the question paper, being a common incorrect answer.

Syllabus sections