O-LevelBiologyCell Biology5090/21 · Oct/Nov 2019 · Q210 Marks
The diagram shows the structure of a virus. [Figure 2.1] The diagram shows how the structural features found in plant cells and in animal cells can be grouped together. [Figure 2.2]
- (a)Identify the structures labelled A and B on the diagram. A B[2]
- (b)Name a disease caused by a virus a bacterium[2]
- (c)(i)State two characteristics of bacteria that are not characteristics of viruses. 1 2[2]
- (c)(ii)State one structural feature absent in a bacterial cell that is always present in a plant cell.[1]
- (d)List three features that would be grouped in region C on the diagram. 1 2 3[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 2019). The mark or mark type is shown in brackets.
- [1] (A) protein (coat) / capsid;
- [1] (B) RNA or DNA ;
- [1] any viral disease;
- [1] any bacterial disease ;
- [1] cell / unicellular ;
- [1] cytoplasm;
- [1] plasmid;
- [1] cell membrane ;
- [1] cell wall;
- [1] ribosomes;
- [1] flagellum;
- [1] capsule;
- [1] reproduce without host / asexual reproduction / binary fission;
- [1] respiration;
- [1] method of nutrition ;
- [1] nucleus;
- [1] cellulose cell wall;
- [1] mitochondria ;
- [1] large vacuole / cell sap;
- [1] cytoplasm;
- [1] nucleus;
- [1] cell membrane ;
- [1] ribosomes;
- [1] mitochondria ;
- [1] vacuole;
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