MEDIUM
AS and A Level
IMPORTANT
Earn 100
Explain the difference between a pathogen and an antigen.
Important Questions on Immunity
MEDIUM
AS and A Level
IMPORTANT
Some people say that in an immune response a pathogen chooses the lymphocytes that will destroy them. Do you agree?
MEDIUM
AS and A Level
IMPORTANT
The receptors on the surface of the mature B cells illustrated in the above figure are not drawn to scale. Receptors on cell surfaces are not visible at this magnification but can be shown in diagrams like this. Discuss why each clone only has one type of B cell receptor.
MEDIUM
AS and A Level
IMPORTANT
Analogies are often useful in science. An analogy is used to try to explain an unfamiliar topic by comparing it to something that is more familiar, for example, the action of the heart is often compared with a pump. Try to think of an analogy to explain clonal selection.
MEDIUM
AS and A Level
IMPORTANT
Looking at the above figure, explain why only cells in clone Y have responded to the antigen.
EASY
AS and A Level
IMPORTANT
Calculate the diameter of the plasma cell in the above figure at its widest point.
EASY
AS and A Level
IMPORTANT
Explain why B cells divide by mitosis during an immune response.
MEDIUM
AS and A Level
IMPORTANT
Explain how plasma cells, such as the one shown in the above figure, are adapted to secrete large quantities of antibody molecules.
MEDIUM
AS and A Level
IMPORTANT
Looking at the figure, state how the secondary immune response differs from the primary immune response.
