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Question 19M.1B.SL.TZ2.1d

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

State one technological improvement, other than enzymatic digestion, that led to the falsification of previous models to determine the current model of membrane structure.

[1]

Markscheme

a. scanning electronmicrography / SEM ✔

b. freeze fracture/etching ✔

c. X-ray diffraction
OR
crystallography ✔

d. fluorescent antibody / marker tagging ✔

Do not accept electron microscope

Accept description of process

Examiners report

Stating a technological improvement that led to the currently accepted model of the cell membrane proved more challenging and only the better candidates answered correctly.

Syllabus sections