1- Cytotoxic T cells recognize and kill host cells infected by
viruses. They recognize these cells by the foreign antigen
displayed on the host cell’s:
MHC I molecules
MHCII molecules
toll like receptors
2- Clonal selection:
can be caused by vaccinations
explains why the immune system responds stronger to a second
infection than a first
results in antibody specificity following a bacterial infection
all of the above
3- Which of the following describes...
Considering the structure and composition of SARS-CoV-2, list
possible antigens for antibody binding. Which one do you think
would be the most effective for a diagnostic serological assay?
Influenza viruses gain entry into their host cells by attachment
to N-acetylneuraminic acid residues on the cell surface, followed
by receptor-mediated endocytosis. What effect would the following
treatments have on attachment of the virion to a susceptible
cell.
i.Treatment of the susceptible cell with neuraminidase
ii.Treatment of the susceptible cell with NH4 Cl to prevent
lowering of lysosomal pH
iii. Treatment of the susceptible cell with actinomycin D, which
prevents synthesis of messenger mRNA
b. What effect would these same...
Antibody is prepared to the thr repressor protein
isolated from a wild-type strain. Competetive antibody
binding assays show that several times more repressor is present in
an extract prepared from the derepressed mutant described above
than in an extract prepared from the wild-type
strain. What is your interpretation of these data?
The repressor protein requires a pH of 6.1 for optimal binding
to its operator in vitro. If the pH goes above
pH 8.0, the repressor is unable to bind. What amino acid
side...
Why do most scientists agree that viruses are nonliving
entities?
They cannot replicate outside host cells.
They are composed of relatively simple components.
They are not composed of cells.
They pass through filters.
They cause diseases in host cells.
Bacteriophages viruses infect bacterial cells. Ocassionally
during viral assembly,host cell DNA is accidently incorporated into
the new viral particle instead of phage DNA. THe newly formed
bacteriophage particle transfers this DNA to another bacterial
cell. What is this process called?
1 conjugation
2 transformation
3 transduction
4 binary fission
5 Abduction
What is the order for monoclonal antibody production?
Growth of hybridoma cells
Plasma cells isolated from mouse spleen
Growth of plasma cells
Immunisation of mouse spleen
Growth of myeloma cells
Fusion of plasma cells and myeloma cells
T-cells interact with free antigens.
True
False
An autoimmune disease can develop when antibodies bind
to self-antigens.
True
False
The antigen recognized by antigen presenting cells is
the same antigen presented to activated T-cells.
True
False
Bee stings and peanut allergies are examples of Type IV
– Delayed Cell mediated hypersensitivity.
True
False
Which of the following would not present antigens to a
T-helper cell?
lymphocytes with antibody producing capability
cells that recognize MHC class I molecules
differentiated monocytes
cells...