Immunity : cells topic 2

Question 1

Define the term antigen

Answer 1

A protein/glycoprotein/ glycolipid found on the cell surface membrane
Identify a cell as self or non-self / allows cellular recognition of self / triggers an immune response

Question 2

Give two examples of places where non- self antigens

Answer 2

surface of invading pathogens
toxins
surface of infected body cells
surface of infected cancerous cells/ tumour cells
surface of cells from another individual after a transplant

Question 3

Describe the sequence of events that take place during phagocytosis.

Answer 3

The phagocyte engulfs the pathogen, which