Practice Quiz 16 ( Immune system )
You have 25 minutes to finish the quiz.
Q.1 :
An antigen is
a protein molecule that helps defend the body against disease
a type of white blood cell
an invading virus or bacterium
a foreign molecule that evokes a specific response by a lymphocyte
Q.2 :
B cells will react
nonspecifically with any foreign matter they encounter
with only one specific epitode on an antigen.
only with specific antibody molecules.
with all epitodes on a specific antigen.
none of the above
Q.3:
The class II MHC proteins are
secreted by plasma cells
on the surface of all nucleated cell types
are the same within a species
found on the surface of helper T cells
Q.4
Which statement describes best a step during the
cellular
immune response
Upon exposure to an antigen , B-cell produce antibodies
cytotoxic T cells release perforin
histamine release triggers the dialation of blood vessels
memory cell recognize an antigen
Q.5 :
Which of these cells is a phagocytic white blood cell that can engulf a foreign bacterium ?
B cell
cytotoxic T cell
plasma cell
helper T cell
macrophage
Q.6 :
Which statement about major histocompatibility complex (MHC) proteins is false
the genes for MHC proteins are highly polymorphic (consist of numerous alleles)
the MHC genes code for cell surface proteins
the MHC genes code for immunoglobulins
plays a role in skin graft rejection.
all are correct
Q.7:
Which of the following is NOT true about antibodies?
they are secreted by plasma cells
they will bind to specific antigens
they are effective only when attached to white blood cells
all are true
Q.8:
Which is not part of the humoral immune response
production of antibodies by plasma cells
antibody / antigen interaction
incorporation of antigen into MHCII complex of macrophages
all are part of the humoral response
Q.9:
Which decribes best autoimmune disease. The immune system
of an individual is not responding to a foreign invador
responds to some of an individual's own MHC class I markers as antigens
is hyperactive
is infected by HIV
Q.10:
Which of the following is
not
a nonspecific host defense?
the skin as a physical barrier
lysozyme which hydrolyzes bacterial cell walls
release of histamine
secretion of fluid to the exterior of certain tissue
all of the above are nonspecific host defenses