micro exam #6 - Assignment Essays

micro exam #6

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Posted on

May 24th, 2023

question

T/F A headache is a classic example of a sign of a disease.

answer

false

question

T/F: it is thought that the waxes in the cell walls of mycobacterium tuberculosis protect this pathogen from digestion within phagocytes

answer

true

question

which of the following pathogens produce enterotoxins?
a. bacillus cereus and certain serotypes of E. coli
b. clostridium difficile and clostridium perfringens
c. salmonella spp and shigella spp
d. all of the above

answer

d. all of the above

question

a bloodstream infection with ______ could result in the release of endotoxin into the bloodstream

answer

neisseria gonorrhoeae or escherichia coli

question

which of the following virulence factors enable bacteria to avoid phagocytosis by white blood cells?
a. capsule
b. cell membrane
c. cell wall
d. pili

answer

a. capsule

question

T/F Avirulent strains do not cause disease.

answer

true

question

T/F To cause disease, all bacterial pathogens must first attach to some tissue in the body.

answer

false

question

T/F: although most people use the terms "infection" and "infectious disease" synonymously, microbiologists define infection as colonization by a pathogen

answer

true

question

T/F: rickettsias and chlamydias are examples of obligate intracellular pathogens

answer

true

question

T/F: ehrlichia spp. are intraleukocytic pathogens

answer

true

question

T/F: the terms "leukemia" and "leukopenia" both refer to an abnormally low number of circulating leukocytes

answer

false

question

which of the following is not a consequence of activation of the complement system?
a. attraction and activation of leukocytes
b. increased phagocytosis by phagocytic cells (opsonization)
c. lysis of bacteria and other foreign cells
d. repair damaged tissue

answer

d. repair damaged tissue

question

T/F: interferons only affect viruses, but are not viral species specific

answer

true

question

T/F: chemokines are chemotactic agents that are produced by various cells of the human body

answer

true

question

T/F: eosinohils are much better pahgocytes than neutrophils

answer

false

question

all of the following would be considered an aspect of microbial antagonism except:
a. competition for nutrients
b. competition for space
c. production of bacteriocins
d. production of lysozyme

answer

d. production of lysozyme

question

each of the following is considered a part of the bodys second line of defense except:
a. fever
b. inflammation
c. interferons
d. lysozyme

answer

d. lysozyme

question

T/F: complement is the name of a single plasma protein that complements the actions of the immune system

answer

false

question

T/F: lactoferrin and transferrin are proteins that bind iron, and therefore deprive pathogens of this essential nutrient

answer

true

question

T/F: common allergic reactions, such as those experienced in hayfever, are also known as anaphylactic reactions

answer

true

question

antibodies are secreted by:

answer

plasma cells

question

T/F: autoimmune diseases are always the result of type II hypersensitivity reactions

answer

false

question

lgM antibodies are basophils play major roles in anaphylactic reactions

answer

false

question

T/F: the penicillin molecule is an example of a hapten

answer

true

question

Immunity that develops as a result of an actual infection is called:

answer

natural active acquired immunity

question

T/F: if a persons immune system is not functioning properly, that person is said to be immunocompetent

answer

false

question

which of the following produces both a cytotoxin and an enterotoxin?
a. clostridium botulinum
b. clostridium difficile
c. clostridium tetani
d. corynebacterium diphtheriae

answer

b. clostridium difficile

question

T/F: the primary function of NK and K cells is to kill foreign cells, virus infected cells and tumor cells

answer

true

question

of the following, which is the least likely to be involved in cell- mediated immunity?
a. antibodies
b. cytokines
c. macrophages
d. T cells

answer

a. antibodies

question

Natural passive acquired immunity would result from:

answer

ingesting colostrum

1 of 30

question

T/F A headache is a classic example of a sign of a disease.

answer

false

question

T/F: it is thought that the waxes in the cell walls of mycobacterium tuberculosis protect this pathogen from digestion within phagocytes

answer

true

question

answer

d. all of the above

question

a bloodstream infection with ______ could result in the release of endotoxin into the bloodstream

answer

neisseria gonorrhoeae or escherichia coli

question

which of the following virulence factors enable bacteria to avoid phagocytosis by white blood cells?
a. capsule
b. cell membrane
c. cell wall
d. pili

answer

a. capsule

question

T/F Avirulent strains do not cause disease.

answer

true

question

T/F To cause disease, all bacterial pathogens must first attach to some tissue in the body.

answer

false

question

T/F: although most people use the terms "infection" and "infectious disease" synonymously, microbiologists define infection as colonization by a pathogen

answer

true

question

T/F: rickettsias and chlamydias are examples of obligate intracellular pathogens

answer

true

question

T/F: ehrlichia spp. are intraleukocytic pathogens

answer

true

question

T/F: the terms "leukemia" and "leukopenia" both refer to an abnormally low number of circulating leukocytes

answer

false

question

answer

d. repair damaged tissue

question

T/F: interferons only affect viruses, but are not viral species specific

answer

true

question

T/F: chemokines are chemotactic agents that are produced by various cells of the human body

answer

true

question

T/F: eosinohils are much better pahgocytes than neutrophils

answer

false

question

all of the following would be considered an aspect of microbial antagonism except:
a. competition for nutrients
b. competition for space
c. production of bacteriocins
d. production of lysozyme

answer

d. production of lysozyme

question

each of the following is considered a part of the bodys second line of defense except:
a. fever
b. inflammation
c. interferons
d. lysozyme

answer

d. lysozyme

question

T/F: complement is the name of a single plasma protein that complements the actions of the immune system

answer

false

question

T/F: lactoferrin and transferrin are proteins that bind iron, and therefore deprive pathogens of this essential nutrient

answer

true

question

T/F: common allergic reactions, such as those experienced in hayfever, are also known as anaphylactic reactions

answer

true

question

antibodies are secreted by:

answer

plasma cells

question

T/F: autoimmune diseases are always the result of type II hypersensitivity reactions

answer

false

question

lgM antibodies are basophils play major roles in anaphylactic reactions

answer

false

question

T/F: the penicillin molecule is an example of a hapten

answer

true

question

Immunity that develops as a result of an actual infection is called:

answer

natural active acquired immunity

question

T/F: if a persons immune system is not functioning properly, that person is said to be immunocompetent

answer

false

question

which of the following produces both a cytotoxin and an enterotoxin?
a. clostridium botulinum
b. clostridium difficile
c. clostridium tetani
d. corynebacterium diphtheriae

answer

b. clostridium difficile

question

T/F: the primary function of NK and K cells is to kill foreign cells, virus infected cells and tumor cells

answer

true

question

of the following, which is the least likely to be involved in cell- mediated immunity?
a. antibodies
b. cytokines
c. macrophages
d. T cells

answer

a. antibodies

question

Natural passive acquired immunity would result from:

answer

ingesting colostrum

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