(a)[3]
Outline the characteristics of non-self antigens.
(b)[4]
Table 3.1 shows four distinct types of cells in the immune system. Complete Table 3.1: put a tick (✓) where the description applies to the named immune cell, and a cross (\times) where it does not.
(c)[3]
The cell cycle may be split into several sections. Complete statements A, B and C to add more detail about the mitotic cell cycle. A The part of the cell cycle that comes directly after mitosis is __________. B The part of the cell cycle that contains the S phase is __________. C The principal event during the S phase is __________.