DP Biology (first assessment 2025)

Test builder »

Question 19M.1B.SL.TZ2.1c.i

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

Deduce one conclusion about the structure of the plasma membrane reached by the scientists from their results.

[1]

Markscheme

a. phospholipids on outside/exposed ✔

b. impossibility of continuous protein layer «of Davson–Danielli/model A» ✔

c. supports idea of mosaic pattern of membrane
OR
supports model B ✔

Award any other valid conclusion.

Do not accept "membrane is made of phospholipids".

Examiners report

Many candidates answered that the enzyme acted on the phospholipids but failed to make a deduction about the structure of the membrane.

Syllabus sections