Practise phagocytosis, antigen-specific lymphocyte responses, antibody action and vaccination while comparing active, passive, primary and secondary immunity.
Some responses made by cells of the immune system to a pathogen are listed.
1 mitosis
2 recognises a pathogen
3 produces memory cells
4 secretes enzymes
Which responses are correct for phagocytes?
1, 2, 3 and 4
1, 2 and 3 only
1 and 3 only
2 and 4 only
Which statement about the properties of the antigen-binding sites in different antibody molecules is correct?
They are located on the light chains only.
They have a hinge region to give flexibility for different antigens.
They have binding sites for receptors on phagocytes.
They have variable amino acid sequences for different antigens.
A person's blood group is determined by antigens present on the red blood cells.
The table shows the antigens and antibodies in the blood of people with different blood groups.
During a blood transfusion, it is essential that the person receiving the blood does not have antibodies to the donor's blood.
Which blood groups can be given to a person with blood group A B ?
A B only
O only
A and B only
A, B, AB and O
The diagram shows a stage in monoclonal antibody production.
T-lymphocytes
B-lymphocytes
antigens
antibodies