(a)[3]
Name the bases indicated by J and K, and state the bond labelled L.
(b)[4]
Explain how the mode of action of zidovudine differs from that of efavirenz.
(c)[2]
People receiving drug treatment for HIV take a mixture of drugs that work in different ways. Suggest the advantage of taking a mixture of the drugs shown in Table 4.1.
(d)[2]
Antibiotics are given to people with HIV/AIDS to treat secondary infections, but they are not used to treat the HIV infection itself. Explain why this is so.