(a)[2]
Identify the parts of the virus labelled N and O.
(b(i))[3]
Use the information in Fig. 4.2 to calculate the percentage change in the number of lymphocytes from month 10 to month 60. Round your answer to two significant figures.
(b(ii))[2]
Describe the changes in the number of lymphocytes, over the 84 months following infection with HIV, shown in Fig. 4.2.
(b(iii))[4]
Outline the consequences of the changes in the number of lymphocytes for the health of the person infected with HIV.
(b(iv))[2]
Explain why antibiotics are not used to treat viral infections.