Practise phagocyte recognition and digestion, self versus non-self antigen responses, the primary lymphocyte sequence and memory-cell protection on re-exposure.
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
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 events listed occur during the primary immune response to a specific pathogen.
1 activation of B-lymphocyte to produce plasma cells and memory cells
2 phagocytosis of invading pathogens by macrophages
3 T-helper cell activation and production of T-killer cells
4 expression of antigens on phagocyte cell surface
5 production and release of antibodies
Which row identifies a correct sequence of events?
A
5
1
2
4
2
4
3
1
last
4
2
1
5
3
4
2
3
1
5