Biology 9700 · AS & A Level · Infectious diseases

Infectious diseases — practice question

Viruses have several shared structural features. In addition, some viruses, including human immunodeficiency virus (HIV), possess an outer envelope as part of their structure.
(a)[3]

Outline the principal structural features of viruses.

(b(i))[1]

Using the information in Fig. 4.1, it can be shown that $13\%$ of pregnant women living with HIV received ART in 2005. Calculate what percentage of pregnant women living with HIV received ART in 2013.

(b(ii))[3]

Describe the patterns shown in Fig. 4.1.

(b(iii))[3]

Suggest and explain the global importance of providing ART to all pregnant and breastfeeding women living with HIV.

(iii)[3]

Suggest and explain the global importance of providing ART to all pregnant and breastfeeding women living with HIV.

(c(i))[1]

State what is injected into the mouse at step 1.

(c(ii))[1]

Explain why several weeks, rather than several days, separate step 1 and step 2.

(c(iii))[1]

State one feature of the myeloma mouse cells, used in step 3, that is essential to this production process.

(c(iv))[1]

Give the name of the fused cells produced in step 4.

(c(v))[1]

Explain why step 6 is required.

(i)[1]

State what is injected into the mouse at step 1.

(ii)[1]

Explain why several weeks, rather than several days, separate step 1 and step 2.

(iv)[1]

Identify the fused cells made in step 4.

(v)[1]

Explain why step 6 is required.

Worked solution & mark scheme

This 22-mark question has a full step-by-step worked solution and mark scheme. One marking point: Has a protein coat (capsid)

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