NR507 Week 1 Quiz Latest 2017
NR507 Week 1 Quiz Latest 2017
2 / 2 pts
After sexual transmission of HIV, a person can be infected yet seronegative for _____ months.
24 to 36
6 to 14
18 to 20
1 to 2
Question 2
2 / 2 pts
Once they have penetrated the first line of defense, which microorganisms do neutrophils actively attack, engulf, and destroy by phagocytosis?
Mycoplasma
Fungi
Viruses
Bacteria
Question 3
2 / 2 pts
Cells in _____ may act as a reservoir in which HIV can be relatively protected from antiviral drugs.
bone marrow
the lungs
the thymus gland
the central nervous system
HIV may persist in regions where the antiviral drugs are not as effective, such as the
CNS.
Question 4
2 / 2 pts
What of the following remains a significant cause of morbidity and mortality worldwide?
Cardiovascular disease
Starvation
Traumatic injury
Infectious disease
Question 5
2 / 2 pts
Which statement about vaccines is true?
Most viral vaccines are made by using dead organisms.
Vaccines require booster injections to maintain lifelong protection.
Vaccines provide effective protection for all people against viruses, bacteria, and fungal infections.
Most bacterial vaccines contain attenuated organisms.
Question 6
2 / 2 pts
Which statement is true about fungal infections?
They are prevented by vaccines.
They result in release of endotoxins.
They occur only on skin, hair, and nails.
They are controlled by phagocytes and T lymphocytes.
Question 7
2 / 2 pts
What is the mechanism in type III hypersensitivity reactions?
Antibodies bind to the antigen on the cell surface.
Antibodies bind to soluble antigens that were released into body fluids and the immune complexes are deposited in the tissues.
Cytotoxic T lymphocytes or lymphokine-producing Th1 cells attack and destroy cellular targets directly.
Antibodies coat mast cells by binding to receptors that signal its degranulation followed by discharge of preformed mediators.
Question 8
2 / 2 pts
A person with type O blood is likely to have high titers of anti-___ antibodies.
O
B
A
A and B
Question 9
2 / 2 pts
What disease involves the deposition of circulating immune complexes containing an antibody against host DNA, resulting in tissue damage?
Pernicious anemia
Myasthenia gravis
Hemolytic anemia
Systemic lupus erythematosus (SLE)
Question 10
2 / 2 pts
In which primary immune deficiency is there a partial to complete absence of T-cell immunity?
DiGeorge syndrome
Bruton disease
Reticular dysgenesis
Adenosine deaminase (ADA) deficiency
Question 11
2 / 2 pts
Hypersensitivity is best defined as a(n)
disturbance in the immunologic tolerance of self-antigens.
altered immunologic response to an antigen that results in disease.
undetectable immune response in the presence of antigens.
immunologic reaction of one person to the tissue of another person.
Question 12
2 / 2 pts
The class of antibody involved in type I hypersensitivity reactions is
IgE.
IgM.
IgA.
IgG.
Question 13
2 / 2 pts
Deficiencies in which element can produce depression of both B- and T-cell function?
Magnesium
Iron
Iodine
Zinc
Question 14
2 / 2 pts
What effect does estrogen have on lymphocytes?
Enhancement of B cells and T cells
Depression of T cells and enhancement of B cells
Depression of B cells and enhancement of T cells
Depression of B cells and T cells
Question 15