AQA A-LEVEL BIOLOGY IMMUNITY
REVISION PAPER 2023 WITH CORRECT
QUESTIONS AND ANSWERS
Pathogen (Correct Answers) A microorganism that causes disease
Self (Correct Answers) The body's own cells and molecules.
Foreign (non-self) (Correct Answers) Not your own body's cells and molecules.
Antigen (Correct Answers) A molecule that triggers an immune response by
lymphocytes.
Lymphocyte (Correct Answers) Type of white blood cell responsible for the immune
response. They become activated in the presence of antigens. There are two types: B
lymphocytes and T lymphocytes.
Phagocyte (Correct Answers) Type of white blood cell which carries out a non-specific
immune response and ingests and breaks down pathogens by phagocytosis.
Phagocytosis (Correct Answers) Mechanism by which phagocytes engulf particles to
form a vesicle or a vacuole.
Lysosome (Correct Answers) Contain enzymes called lysozymes which they release
into the phagosome which hydrolyse the bacterium.
Phagosome (Correct Answers) A vesicle formed as the bacterium is engulfed by the
phagocyte. The lysosome release their lysozymes into the phagosome.
Antigen-presentation (Correct Answers) When an antigen-presenting cell e.g.
phagocyte displays foreign antigens on their own cell-surface membrane.
Cell-mediated immunity (Correct Answers) The type of response when T lymphocytes
respond to antigens that are presented on a body cell.
T Cells (Correct Answers) Cells which mature in the thymus and are associated with
cell-mediated immunity.
REVISION PAPER 2023 WITH CORRECT
QUESTIONS AND ANSWERS
Pathogen (Correct Answers) A microorganism that causes disease
Self (Correct Answers) The body's own cells and molecules.
Foreign (non-self) (Correct Answers) Not your own body's cells and molecules.
Antigen (Correct Answers) A molecule that triggers an immune response by
lymphocytes.
Lymphocyte (Correct Answers) Type of white blood cell responsible for the immune
response. They become activated in the presence of antigens. There are two types: B
lymphocytes and T lymphocytes.
Phagocyte (Correct Answers) Type of white blood cell which carries out a non-specific
immune response and ingests and breaks down pathogens by phagocytosis.
Phagocytosis (Correct Answers) Mechanism by which phagocytes engulf particles to
form a vesicle or a vacuole.
Lysosome (Correct Answers) Contain enzymes called lysozymes which they release
into the phagosome which hydrolyse the bacterium.
Phagosome (Correct Answers) A vesicle formed as the bacterium is engulfed by the
phagocyte. The lysosome release their lysozymes into the phagosome.
Antigen-presentation (Correct Answers) When an antigen-presenting cell e.g.
phagocyte displays foreign antigens on their own cell-surface membrane.
Cell-mediated immunity (Correct Answers) The type of response when T lymphocytes
respond to antigens that are presented on a body cell.
T Cells (Correct Answers) Cells which mature in the thymus and are associated with
cell-mediated immunity.
