AQA A LEVEL BIOLOGY: IMMUNITY Questions With Accurate
Answers
what are the two type of defence mechanisms? - Accurate answers specific, non specific
what are two types of non specific defence mechanisms? - Accurate answers physical barrier
(skin), phagocytosis
what are two types of specific defence mechanisms? - Accurate answers cell mediated response,
humoral response
what is an antigen? - Accurate answers part of a substance that is recognised as non-self by
immune system and triggers immune response
How can T cells identify invader cells from normal cells? (4 ways) - Accurate answers a phagocyte
(that has carried out phagocytosis) present a pathogens antigens on its surface, body cells (who have
been invaded by a virus) present viral antigens on their surface, transplanted cells have different
antigens on their surface, cancer cells present antigens on cell surface
what is the main difference between cell-mediated immunity and humoral immunity? - Accurate
answers T lymphocytes only respond to antigens on a body cell, B cells respond to antigens found in
blood/tissue fluid
what are the 4 different functions of a cloned T cell? - Accurate answers memory cell, stimulate B
cells to divide, stimulate phagocytosis, cytotoxic T cells
How do cytotoxic T cells kill infected cells? - Accurate answers Produce perforin, make holes in cell
surface membrane, becomes freely permeable to all substances, dies
How does an antibody lead to the destruction of a cell? - Accurate answers agglutination of
bacterial cells makes it easier for phagocytes to locate and destroy, act as markers for phagocytes to
destroy cells they are attached to
Answers
what are the two type of defence mechanisms? - Accurate answers specific, non specific
what are two types of non specific defence mechanisms? - Accurate answers physical barrier
(skin), phagocytosis
what are two types of specific defence mechanisms? - Accurate answers cell mediated response,
humoral response
what is an antigen? - Accurate answers part of a substance that is recognised as non-self by
immune system and triggers immune response
How can T cells identify invader cells from normal cells? (4 ways) - Accurate answers a phagocyte
(that has carried out phagocytosis) present a pathogens antigens on its surface, body cells (who have
been invaded by a virus) present viral antigens on their surface, transplanted cells have different
antigens on their surface, cancer cells present antigens on cell surface
what is the main difference between cell-mediated immunity and humoral immunity? - Accurate
answers T lymphocytes only respond to antigens on a body cell, B cells respond to antigens found in
blood/tissue fluid
what are the 4 different functions of a cloned T cell? - Accurate answers memory cell, stimulate B
cells to divide, stimulate phagocytosis, cytotoxic T cells
How do cytotoxic T cells kill infected cells? - Accurate answers Produce perforin, make holes in cell
surface membrane, becomes freely permeable to all substances, dies
How does an antibody lead to the destruction of a cell? - Accurate answers agglutination of
bacterial cells makes it easier for phagocytes to locate and destroy, act as markers for phagocytes to
destroy cells they are attached to
