1a4 marks
Describe the structural features common to all viruses.
1b2 marks
Viruses can vary greatly. The structure of bacteriophage lambda is different to that of coronaviruses.
Compare the structural differences between bacteriophage lambda and coronaviruses.
1c4 marks
The human immunodeficiency virus (HIV) contains a protein capsid and a viral envelope consisting of a lipid bilayer and glycoproteins.
(i) State the role of the protein capsid in HIV.
[1]
(ii) Explain the purpose of the envelope of HIV.
[3]
1d2 marks
Explain why the structural features of viruses could be regarded as an example of convergent evolution.
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