study Unit 6-10
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | True
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| show | True
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| Which of the following virulent factors impairs phagocytosis? A. capsules B. components of the cell wall C. coagulases D. all of the above | show 🗑
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| Which of the following refers to the presence of toxins in the blood? A. bacteriemia B. anemia C. toxemia D. gonorrhoeae | show 🗑
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| show | True
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| The removal of plasmids reduces virulence in which of the following organisms? A. Clostridium tetani B. Escherichia coli C. Staphylococcus aureus D. Streptococcus mutans E. Clostridium botulinum | show 🗑
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| Which of the following is not a portal of entry for pathogens? A. mucous membranes of the respiratory tract B. mucous membranes of the gastrointetenal tract C. skin D. blood E parenteral route | show 🗑
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| show | D. destruction of adhesins
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| An encapsulated bacterium can be virulent because the capsule A. resists phagocytosis B. is an endotoxin C. destrous host tissues D. interferes with physiological processes | show 🗑
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| A drug that binds to mannose on human cells would prevent A. the entrance of Vibrio enterotoxin B. the attachment of pathogenic E. coli C. the action of botulinum Toxin D. streptococcal pneumonia | show 🗑
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| show | C. Cryptosporidium is more virulent
than Campylobacter
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| The earliest smallpox vaccines were infected tissue rubbed into the skin of a healthy person. That recipient of the vaccine usually developed a mild case of smallpox, recovered, & was immune thereafter. The reason this vaccine did not kill more people is; | show 🗑
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| show | B. suface protein genes in
Neisseria ganorrhoeae mutate
frequently
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| Which of the following statements is true? A. evolution selects for the most virulent pathogens B. A successful pathogen doesn't kill its host before it is transmitted C. a successful pathogen never kills its host | show 🗑
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| show | True
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| Pathology is the scientific study of disease. True or False | show 🗑
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| Microorganisms that establish permanent residence without causing disease become 'normal microbiota. True or False | show 🗑
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| show | A. parasitism
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| show | C. commensalism
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| Which of the following is an emerging infectious disease? A. lyme disease B. anthrax C. mad cow disease D. hantavirus E. all of the above | show 🗑
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| Emergence of new infectious diseases is probably due to the following except? A. need of bacteria to cause disease B. humans traveling by air C. changing environments i.e. flood, drought, pollution | show 🗑
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| show | A. the ornithologists are eating
the same food
B. they are contaminating their
hands while handling the owls
and nests
C. one of the workers is a
Samonella carrier
D. their drinking water is
Contaminated
ANSWER: b
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| show | A. E. coli never causes disease
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| Which of the following is NOT one of Koch's Kostulates? A. pathogen must be isolated & grown in pure culture from the diseased host B. disease must be transmitted from a diseased animal to a Healthy, susceptible laboratory animal by some form of contac | show 🗑
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| show | True
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| show | True
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| show | False
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| show | False
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| A fomite is a living reservoir; e.g., ticks carry the causative agent for Lyme disease. True or False | show 🗑
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| Nosocomial infections are common and occur in hospitals where there is a compromised host and a chain of infection. True or False | show 🗑
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| show | True
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| RNA polymerase catalyzes transcription. True or False | show 🗑
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| show | True
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| show | False
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| show | True
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| The transfer of DNA from a donor to a recipient cell by a bacteriophage. A. conjugation B. transcription C. transduction D. transformation E. translation | show 🗑
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| The transfer of DNA from a donor to a recipient as naked DNA in solution. A. conjugation B. transcription C. transduction D. transformation E. translation | show 🗑
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| Feedback inhibition differs from repression because feedback inhibition A. is less precise B. is slower acting C. stops the action of Preexisting enzymes D. stops the synthesis of new enzymes E. all of the above | show 🗑
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| show | D. all of the above
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| show | B and C
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| Plasmids differ from transposons because plasmids A. become inserted into chromosomes B. are self-replicated outside the chromosome C. move from chromosome to chromosome D. carry genes for antibiotic resistance | show 🗑
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| show | True
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| The mechanism by which the presence of glucose inhibits the lac operon. A. catabolite repression B. DNA polymerase C. induction D. Repression E. translation | show 🗑
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| show | False
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| Two daughter cells are most likely to inherit which one of the following from the parent cell? A. change in a nucleotide in mRNA B. change in a nucleotide in tRNA C. change in a nucleotide in rRNA D. change in a nucleotide in DNA E. change in a pro | show 🗑
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| Most microbes grow optimally at or around 37 C. True OR False | show 🗑
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| Microbial growth refers to an increase in the size of individual microbes. True or False | show 🗑
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| The generation time is the amount of time required for a population of bacteria to double in size. True or False | show 🗑
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| show | D. death phase
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| Which of the following terms refers to the destruction and removal of ALL forms of microbial life. A. Sterilization B. disifection C. antisepsis D. sanitation | show 🗑
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| show | D. small mineral requirements
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| Which one of the following temperatures is most ideal for a mesophile? A. -50 C B. 9 C C. 60 C D. 0 C E. 37 C | show 🗑
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| All of the following are true about agar except A. It is a source of nutrients in culture media B. it is a polysaccharide C. It liquifies at 100 C D. It solidifies at approximately 40 C E. It is metabolized by few bacteria | show 🗑
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| show | B. reducing media
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| An organism that has peroxidase and superoxide dismutase but lacks catalase is most likely an A. aerobe B. aerotolerant anaerobe C. obligate anaerobe | show 🗑
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| show | D. pasteurization
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| show | B. ethylene oxide
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| show | D. halogens
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| show | B. sporicidal
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| Immunity is the ability to fight off disease. True or False | show 🗑
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| show | True
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| Which of the following are part of the non-specific defense system? A. complement system B. inflammation C. phagocytosis D. mucus membranes E. all of the above | show 🗑
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| A substance that induces a specific immune response is ... A. a pathogen B. an antigen C. a hormone D. a cytokine | show 🗑
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| What type of cell contain CD4 receptors and play a pivotal role in activating both humoral and cell-mediated immunity? A. helper T cells B. helper B cells C. plamsa cells D. natural killer cells | show 🗑
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| Legionella uses C3b receptors to enter monocytes. This ... A. prevents phagocytosis B. degrades complement C. inactivates complement D. prevents inflammation | show 🗑
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| Chlamydia can prevent the formation of phagolysosomes, and therefore can ... A. avoid being phagocytized B. avoid compliment fixation C. prevent adherence D. avoid being digested E. none of the above | show 🗑
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| show | C. formation of phagosome
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| If the following are placed in order of occurrence, which would be the third step in the complement system? A. activation of C5-C9 B. cell lysis C. anatigen-antibody reaction D. activation of C3 | show 🗑
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| A human host can prevent a pathogen from getting enough iron by ... A. reducing dietary intake B. binding iron with transferrin C. binding iron with hemoglobin D. excreting excess iron Points Received: 2 of 2 | show 🗑
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| show | B. hydrochloric acid
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| Protection provided by injection of a toxoid is ... A. Innate resistance B. naturally acquired active immunity C. naturally acquired passive immunity D. artificially acquired active immunity E. artificially acquired passive im | show 🗑
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| show | A. an antigen
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| Helper T cells activate B cell proliferation. True or False | show 🗑
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| Humoral immunity involved antibodies that are produced by plasma T cells. True or False | show 🗑
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