(a)[1]
Identify the genus of Helicobacter pylori.
(b)[2]
State two structural features shared by H. pylori and other prokaryotes.
(c(i))[1]
Suggest a treatment for this infection.
(c(ii))[1]
State one natural defence in the body that is present in the stomach.
(d)[4]
Explain the ways in which active immunity differs from passive immunity.