•B cells are involved in humoral response.
•T cells involved in cell mediated immunity.
suggest how the drug kills only cancer cells.
why there might be problems for the patient when using these vaccines.
Describe what is happening during Stage 1.
Describe the role of Organelle A in the defence against disease.
HSV can remain inactive inside the body for years (lines 2–3). Explain why this virus can be described as inactive.
Suggest one advantage of programmed cell death (line 4).
The scientists concluded that production of this microRNA allows HSV to remain in the body for years (lines 10–12).
Explain how this microRNA allows HSV to remain in the body for years.
What is a poliomyelitis antigen?
antigen on a myeloid leukaemia cell.
Explain why it was necessary to have a control group.
suited to carry out the role of antibodies.
Each antibody can form a complex with only one type of antigen. Explain why.
another. Suggest how this action assists the role of antibodies in agglutination.
Describe other ways than, simple diffusion, by which substances cross this membrane.
Atheroma formation increases a person’s risk of dying.