Microbiology Quiz
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The most abundant class of antibodies in serum is _____.
A. IgD
B. IgM
C. IgE
D. IgG
The term _____ refers to the presence of small numbers of bacteria in the blood.
A. septicemia
B. viremia
C. toxemia
D. bacteremia
Which of the following is not a nitrogenous base in DNA?
A. Adenine
B. Thymine
C. Guanine
D. Ribose
Base pairing in DNA involves which of the following pairs of nucleobases?
A. Adenine (A) and guanine (G)
B. Adenine (A) and cytosine (C)
C. Adenine (A) and thymine (T)
D. Cytosine (C) and thymine (T)
T/F: B lymphocytes and T lymphocytes mature in the thymus gland.
A. TRUE
B. FALSE
DiGeorge syndrome is the result of
A. delayed hypersensitivity.
B. congenital absence or immaturity of the thymus gland.
C. a genetic defect in the development of both T cells and B cells.
D. failure of B-cell development and maturity.
An example of a secondary acquired immunodeficiency is
A. AIDS.
B. adenosine deaminase (ADA) deficiency.
C. agammaglobulinemia
D. DiGeorge syndrome.
The ability of TC cells to initiate apoptosis in virally-infected cells and cancer cells is dependent on their ability to produce __________ and __________; proteins that punch holes in the target cell membrane.
A. perforin; granzyme
B. antibodies; interferons
C. interleukin-1; interleukin-2
D. interferon; interleukins
Under ideal conditions, how often can some food poisoning bacteria split in two?
A. 20 minutes
B. 30 minutes
C. 10 minutes
D. 40 minutes
The initial, brief period of early, general symptoms such as fatigue and muscle aches is the ______.
A. prodromal stage
B. period of invasion
C. incubation period
D. convalescent stage
Which of the following do not serve as antigen presenting cells?
A. Basophils
B. Macrophages
C. B lymphocytes
D. Dendritic cells
What is the purpose of using a spreader in the practical?
A. To sterilize the agar plate
B. To create a sterile environment
C. To spread the bacteria evenly
D. To measure the diameter of clear areas
What identifies the direction of each strand in the DNA molecule?
A. The presence of adenine or thymine
B. The type of sugar in the backbone
C. The numbering of the carbons in each sugar molecule
D. The size of the grooves
Which pathogen is the tiniest
A. viruses
B. bacteria
C. parasites
D. fungi
The stage of an infectious disease when specific signs and symptoms are seen and the pathogen is at peak activity is the
A. incubation period
B. prodromal stage
C. convalescent stage
D. period of invasion
Plasma
A. is the liquid portion of blood in which blood cells are suspended.
B. is mostly water.
C. contains albumin and globulins.
D. All of the choices are correct.
Leukopenia is the _____ in the level of white blood cells in a patient.
A. decrease
B. abnormal production
C. elevation
D. stabilization
A patient enters your clinic with a suspected helminthic infection. In support of this diagnosis, you suspect elevated levels of which antibody in the patient’s serum?
A. IgD
B. IgA
C. IgE
D. IgM
Which of the following is not a structure used for bacterial adhesion?
A. Specialized Receptors
B. Adhesive Slime
C. Fimbriae
D. Cilia
The third line of defense against foreign invaders can be described as having _______ and ________.
A. complexity, versatility
B. specificity; memory
C. diversity; barriers
D. surveillance; complexity
All of the following are granulocytes except _____.
A. Neutrophils
B. Eosinophils
C. Lymphocytes
D. Basophils
E. All of the choices are correct
The difference between the terms pathogenicity and virulence is that
A. pathogens cause disease and their virulence describes the degree of pathogenicity.
B. virulent organisms cause disease, pathogens do not.
C. pathogenic organisms cause disease, virulent organisms do not.
D. virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations.
Which type of haemolysis shows a complete clear circular zone around the bacterial colonies?
A. δ-haemolysis
B. γ-haemolysis
C. β-haemolysis
D. α-haemolysis
What is the significance of the cloudy areas on the agar plate?
A. They are caused by condensation
B. They demonstrate the effectiveness of the substances
C. They show where the agar is damaged
D. They indicate the presence of bacteria
An example of natural active immunity would be
A. chickenpox infection, followed by lifelong immunity.
B. giving a person immune serum globulins to chickenpox virus after exposure to the disease.
C. a fetus acquiring maternal IgG to the chickenpox virus across the placenta.
D. chickenpox vaccine triggering extended immunity to chickenpox.
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