(a)[2]
Suggest why plasma cells have a substantial amount of rough endoplasmic reticulum.
(b)[2]
The diameter A-B of the plasma cell in Fig. 3.1 is $15\,\mu\text{m}$. Calculate the magnification of Fig. 3.1. Show your working.
(c)[1]
Name the causative organism (pathogen) of smallpox.
(d)[3]
Fig. 3.2 shows that the number of smallpox-specific plasma cells rises and then falls within $35$ days after vaccination. Explain how a single dose of this vaccine can provide immunity for up to $10$ years when the plasma cells are short-lived.
(e)[2]
State two reasons why the vaccination programme succeeded in eradicating smallpox.
(f)[1]
State the type of immunity provided by the smallpox vaccine.