Unit 1
Which of the following is an incorrect pairing?
A) viruses; acellular
B) protozoa; unicellular
C) Prokaroyotes:no nuclei
D) algae; motile
E) fungi; cell walls
Which of the following is an advantage of the direct microscopic count?
a) sample volume is unknown
b) requires a large number of cells
c) can easily distinguish live from dead cells
d) can readily count organisms that are motile
e) requires no incubation time
Honey can be stored at room temperature for long periods of time because it
a) is a natural surfactant.
b) is highly acidic.
c) contains oxidizing agents.
d) contains lysozyme.
e) is hypertonic.
In rheumatoid arthritis, IgM, IgG, and complement deposit in joints. This is an example of
a) immunosuppression.
b) cell-mediated autoimmunity.
c) acquired immunodeficiency.
d) cytotoxic autoimmunity.
e) immune complex autoimmunity.
Leukocidins, Protein A, Coagulase are virulence factors of which pathogen?
a) All species of Staphylococcus
b) S.aureus
c) S.epidermidis
d) S.pyogenes
Which of the following statements about fungi is INCORRECT?
A) yeasts are unicellular.
B) fungi are photosynthetic.
C) fungi have a cell wall.
D) molds are multicellular.
E) fungi are eukaryotes.
Where is the location of electron transport chain in prokaryotes?
a) outer mitochondrial membrane
b) the cytoplasm
c) inner mitochondrial membrane
d) the plasma membrane
Which of the following drugs does NOT affect eukaryotic cells?
a) antihelminthic drugs
b) nucleotide analogs
c) semisynthetic penicillins
d) antifungal drugs
e) antiprotozoan drugs
B cells are primarily activated by the activities of
a)plasma cells.
b) helper T cells.
c) antigens
d.) antibodies
e.) macrophages
Mycoplasma pneumoniae does not respond well to Beta Lactam antimicrobial drugs because
a) it has a capsule
b) it has thick layer of mycolic acid layer
c) it does not have a cell wall
d) it does not have a cell membrane
Which of the listed bacteria genus lack a cell wall.
A) Mycobacteria
B) Bacillus
C) Clostridium
D) Mycoplasma
What is an advantage of the spread plate count?
a) provides immediate results
b) can readily count cells that form aggregates
c) can be performed on very dilute samples, such as lake water
d) can be used to count heat-sensitive bacteria
e) determines the number of viable cells
Polio is transmitted by ingestion of water contaminated with feces containing polio virus. What portal of entry does polio virus use?
a) skin only
b) parenteral only
c) mucous membranes only
d) skin and parenteral
e) skin, parenteral, and mucous membranes
Delayed type hypersensitivity reactions in the skin
a) are characterized by wheal and flare reaction
b) peak at 4 to 6 hours after exposure
c) show induration/leisons because of Tcells and macrophages activity
d) requires complement activation
Koplik spots are unique lesions appearing in which diseases?
a) Roseola
b) Erythema infectiosum
c) Rubella
d) Rubeola
Energy harvesting enzymes, analogous to mitochondria are located where in a prokaryote?
A) Cell Wall
B) Cell Membrane
C) Ribosomes
D) Plasmids
An organism that produces catalase enzyme is protected from the harmful effects of
a) molecular oxygen.
b) singlet oxygen.
c) hydrogen peroxide.
d) hydroxyl radical.
e) superoxide radical
A difference between an acute disease and chronic disease is that chronic diseases have an extended period of __________.
a) incubation
b) illness
c) prodromal
d) convalescence
Which one of the following does not belong to cellular immunity
a) The cells originate in bone marrow.
b) B cells make antibodies.
c) It can inhibit the immune response.
d) T cells react with antigens.
e) Cells are processed in the thymus gland.
Contaminated food is the source of ________, which causes meningitis in the elderly and immunocompromised persons
a) Haemophilus influenzae
b) Listeria monocytogenes
c) Streptococcus pneumoniae
d) Streptococcus agalactiae
e) Neisseria meningitidis
A viroid is made of
A) Protein only
B) Protein and RNA
C) Protein, RNA , and Envelope
D) RNA only
Promoters are specific sequences on ________ that are recognized by ________.
a) RNA / DNA polymerase
b) RNA / RNA polymerase
c) DNA / DNA polymerase
d) DNA / sigma factor
All of the following are methods of food preservation EXCEPT
a) ionizing radiation.
b) osmotic pressure.
c) high pressure.
d) desiccation.
e) microwaves.
The process of desensitization to prevent allergies involves the injection of increasing amounts of
a) IgE.
b) antigen.
c) antihistamine.
d) IgG.
e) RhoGAM.
Which of the following diseases is the result of a bacterial infection of peripheral sensory nerves?
a) rabies
b) tetanus
c) Hansen's disease
d) acute bacterial meningitis
e) botulism