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Question 18N.2.SL.TZ0.a

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Date November 2018 Marks available [Maximum mark: 4] Reference code 18N.2.SL.TZ0.a
Level SL Paper 2 Time zone TZ0
Command term Draw Question number a Adapted from N/A
a.
[Maximum mark: 4]
18N.2.SL.TZ0.a

The structure of prokaryotic cells has been investigated using electron microscopy. Draw a labelled diagram to show prokaryotic cell structure.

[4]

Markscheme

a. cell wall — a uniformly thick wall ✔

b. pili — hair-like structures connected to cell wall
OR
flagellum — at one end only, longer than pili ✔

c. plasma/cell membrane — represented by a continuous single line ✔
May be labelled as the innermost wall line

d. «70S» ribosomes — drawn as small discrete dots not circles ✔

e. naked DNA/nucleoid — region with DNA not enclosed in membrane ✔

f. cytoplasm — the non-structural material within the cell ✔

 

Award [1] for each structure clearly drawn and correctly labelled

Award [2 max] if any eukaryotic structure is drawn and labelled

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