FP SBAs Flashcards
The faeces of a 3-year old child, with acute watery diarrhoea, was prepared and visualised using an electron microscope. This revealed electron-dense, round structures with a diameter of approximately 75nm. What type of biological material do these structures most likely represent?
a) Bacteria
b) Fungal spores
c) Parasite eggs
d) Viruses
e) Worm cysts
d
What is the definition of a plasmid?
a) A circular, auto-replicating piece of DNA
b) A mini chromosome
c) A piece of DNA that transfers between bacteria
d) A piece of DNA that can transfer by conjugation
e) A piece of DNA that carries antimicrobial resistance genes
a
An immune response to infection depends on clonal selection of specific B lymphocytes. What best describes this clonal selection?
a) Activation of B lymphocytes expressing receptors specific to a particular antigen
b) Formation of B lymphocytes from stem cells in the bone marrow
c) Migration of B lymphocytes through lymph nodes
d) Removal of self-reactive B lymphocytes
e) Secretion of IgE antibodies by B lymphocytes
a
What is the main role of the Thymus?
a) Antibody production
b) Educating T cells
c) Phagocytosis of bacteria
d) Providing cytokine help to B cells
e) Red blood cell production
b
