These are a few exam questions taken from exam builder related to plasma membranes OCR A level. It has the mark scheme at the end of the document. Personally, I found this helpful as a few questions from here were in my recent plasma membranes assessment.
i. Explain which of the mean values, A–E, is likely to be the least accurate. You should process data from the table to support your
answer.
[2]
ii. Identify one limitation in the practical procedure that may have caused the results to be inaccurate and explain which cube's
results are most likely to have been affected by this limitation.
Limitation
Is more likely to affect cube ….. because
[
(e). The procedure described above involved the use of model cells. Hydrogen ions from the acid were able to travel freely to the centre
of the agar jelly cubes.
The rate of movement of molecules from the plasma membrane towards the centre of living cells is often greater than that seen in the
procedure the student carried out even if the cells are kept at the same temperature.
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