(a)[3]
Describe the ways HIV can move from one person to another.
(b)[1]
All viruses have genetic material. HIV has genetic material called RNA. State one other feature shared by all viruses.
(c(i))[3]
Describe the role of lymphocytes.
(c(ii))[1]
State how HIV infection affects the lymphocytes if it is untreated.
(d(i))[4]
Explain why vitamin C and iron matter in the human diet.
(d(ii))[2]
Using the treatment-group data in Table 4.2, calculate the percentage decrease in the average number of copies of HIV RNA per cm^{3} of blood.
(d(iii))[2]
Evaluate the effect of the dietary supplements on the lymphocytes. Use the information in Table 4.2 in your answer.