BIO250_Saylor_V5
Unit 15: Diagnosing Infections
Started on Wednesday, October 13, 2021, 8:46 AM
State Finished
Completed on Wednesday, October
... [Show More] 13, 2021, 9:36 AM
Time taken 49 mins 31 secs
Grade 85.50 out of 90.00 (95%)
Question 1
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Question text
Infections that go unnoticed because there are no symptoms are called ______.
Select one:
a. syndromes
b. malaise
c. inflammation
d. asymptomatic
e. secondary infections
Question 2
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Which of the following is a chemical used by phagocytes to destroy ingested foreign
substances?
Select one:
a. Hydrogen peroxide
b. Nitric oxide
c. Lactic acid
d. Superoxide anion
e. All of these are used. CORRECT ANSWER
Question 3
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The third line of defense against foreign invaders can be described as having _______ and
________.
Select one:
a. specificity; memory
b. complexity, versatility
c. diversity; barriers
d. surveillance; complexity
Question 4
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What drug is used in cases of penicillin and methicillin resistance and also used to treat
endocarditis?
Select one:
a. Penicillin G
b. Vancomycin
c. Tetracycline
d. Erythromycin
e. Isoniazid
Question 5
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You have dermatitis triggered by a particular material in your socks. Your feet are covered
with a really itchy rash, which has developed blisters over the last day or so. You had first
worn them 2 to 3 days ago, and you did not launder them after buying them at the
store. Finding some antihistamine medication in your bathroom cabinet, you decide to take
it to relieve the itching rash. Which statement is true?
Select one:
a. The rash will go away because the antihistamine neutralizes the histamine chemicals
coming from mast cells in your skin.
b. The antihistamine will make the rash worse because it reacts with chemicals release by
the lymphocytes in your skin, exacerbating the situation.
c. The anti-histamine will have no effect on the rash because histamine is not the chemical
mediator in this hypersensitivity.d. The anti-histamine will have no effect because once a type I hypersensitivity kicks in, it
will last for a few days.
Question 6
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Serological testing relies upon
Select one:
a. the specificity of the Fc region of antibodies.
b. the specificity of the variable regions of antibodies.
c. a patient who is not immunocompromised.
d. a very high viral or bacterial load in the patient.
Question 7
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One of the major differences between the first and second line of defense is that
Select one:
a. the first line defenses are anatomical barriers whereas the second line defenses are
mechanisms.
b. the first line defenses involve complement proteins whereas the second line defenses
involve antibodies.
c. the first line defenses involve the respiratory tract whereas the second line defenses
involve the gastrointestinal tract.d. the first line defenses are mechanisms whereas the second line defenses are physical
barriers to infection.
Question 8
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Each of the following results in drug resistance, except
Select one:
a. a drug being pumped out of the cell.
b. a drug being used as a nutrient by the cell.
c. a drug binding site being altered.
d. a drug being inactivated.
e. a drug being blocked from entering the cell.
Question 9
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Antiviral drugs that target reverse transcriptase would be used to treat infections caused by
______.
Select one:
a. influenza A virus
b. HIV
c. herpes zoster virus
d. respiratory syncytial virus
e. hepatitis C virusQuestion 10
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Which process involves a more rapid synthesis and greatly increased titer of antibody when
the immune system is subsequently exposed to the same antigen?
Select one:
a. Neutralization
b. Opsonization
c. Complement fixation
d. Agglutination
e. Anamnestic response
Question 11
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Which of the following is not a phenotypic method of identification?
Select one:
a. Morphology
b. Gram stain reaction
c. Acid-fast reaction
d. Antibody response
e. Endospore production
Question 12
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The antibody-secreting progeny cells of a B-cell clone are called
Select one:
a. antibodies.
b. sensitized T cells.
c. activated macrophages.
d. plasma cells.
e. bursa cells.
Question 13
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The shortest time required to kill or inactivate all the microbes in a sample at a specified
temperature is called the
Select one:
a. thermal death point (TDP).
b. thermal death time (TDT).
c. sporicidal time.
d. death phase point.
Question 14
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Keratin is an important aspect of nonspecific defense because it
Select one:
a. is toxic to pathogens.
b. creates a physical barrier against pathogens.
c. destroys pathogens.
d. physically restricts pathogens to a specific region.
Question 15
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Large quantities of antibodies that react to the second entry of antigen and lead to formation
of antigen-antibody complexes occurs in
Select one:
a. serum sickness.
b. delayed hypersensitivity.
c. anaphylaxis.
d. hemolytic disease of the newborn.
Question 16
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Which genus is resident biota of the mouth, large intestine, and within the vagina from
puberty to menopause?
Select one:
a. Lactobacillus
b. Treponema
c. Haemophilus
d. Escherichia
e. Clostridium
Question 17
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Which process involves antibodies cross-linking cells or particles into large aggregates?
Select one:
a. Neutralization
b. Opsonization
c. Complement fixation
d. Agglutination
e. Anamnestic response
Question 18
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Question textOnce a microbe has entered a host, what process performed by certain white blood cells
will attempt to destroy the microbes?
Select one:
a. Phagocytosis
b. Adhesion
c. Encapsulation
d. Margination
e. Exocytosis
Question 19
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The sterilizing gas used in chemiclaves is ______.
Select one:
a. ethylene oxide
b. iodophor
c. glutaraldehyde
d. formaldehyde
e. chlorine dioxide
Question 20
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Vials of microorganisms that undergo the freeze-drying process, called _____, will remain
preserved and viable for years.Select one:
a. desiccation
b. flash freeze
c. lyophilization
d. pasteurization
e. sterilization [Show Less]