Biology 9700 · AS & A Level · Infectious diseases

Infectious diseases — practice question

Morbillivirus, the cause of measles, and human immunodeficiency virus (HIV) have these features in common: • an outer envelope enclosing the protein coat • RNA as the genetic material • infection of cells in the immune system.
(a)[4]

Compare how Morbillivirus and HIV are transmitted.

(b)[2]

Antibiotics are not given for viral infections. Explain why antibiotics do not affect viruses.

(c)

Fig. 4.1 shows the structure of Morbillivirus.

(c(i))[2]

Outline the structural features of the Morbillivirus viral envelope.

(c(ii))[3]

Suggest how Morbillivirus infects a cell containing SLAM glycoproteins so that only nucleoprotein and viral polymerase enter.

(c(iii))[2]

Suggest the function of viral polymerase in Morbillivirus.

(d(i))[1]

State the biological molecule type represented by antigen p24.

(d(ii))[3]

Outline how a monoclonal antibody against antigen p24 is produced.

Worked solution & mark scheme

This 17-mark question has a full step-by-step worked solution and mark scheme. One marking point: Morbillivirus

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