O-LevelBiologyCell Biology5090/21 · Oct/Nov 2017 · Q49 Marks
Fig. 4.1 shows a human cell. [Figure 4.1]
- (a)Name and state the main function of the type of cell shown in Fig. 4.1. name function[2]
- (b)Suggest and explain what symptoms might be experienced by a person with an unusually low number of this type of cell.[4]
- (c)Explain what would happen to the cell shown in Fig. 4.1 if placed in pure water.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [2] (a) red blood (cell) / erythrocyte ; oxygen + carriage / transport / absorption AW ;
- [4] (b) tiredness / fatigue / weak / dizzy / faint; inability to exercise / exert / inactive; breathing problems ; reduced oxygen transport; reduced respiration; reduced energy (release); irregular menstruation AW ;
- [3] (c) low water potential / concentration inside cell; water enters ; by osmosis / diffusion; cell expands; cell bursts; reference to no cell wall;
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