Microbiology straighterline practice exam

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MICROBIOLOGY STRAIGHTERLINE PRACTICE EX r r r



AM| MOST RECENT AND COMPLETE VERSIONALL
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QUESTIONS AND CORRECT ANSWERS GRADE A+| r r r r r r



BRAND NEW r




Protozoa are a diverse group of organisms that often prove difficult to classify intoa tax
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onomy. - r


ANSWER: C. Which class of eukaryotic microorganisms can be subdivided into gro
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ups such as Mastigophora, Sarcodina, Ciliophora, and Apicomplexa?
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A. Helminths
B. Algae
C. Protozoa
D. Fungi


Transposons contain DNA that codes for enzymes that remove it from one site in the ge
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nome and integrate it into another. -
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ANSWER: D. Genetic material can beexcised from one chromosome and directly int
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egrated into another via r r r




A. conjugation.
B. transformation.
C. transduction.
D. transposons.


TH (or T Helper) cells mature in the thymus and become sensitized when it binds to an a
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ntigen/MHC complex. Upon activation, it releases interleukins-2, -4, -5, and
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-6, and interferon gamma which help to activate macrophages, B cells, and TC cells. -
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ANSWER: B. Which immune cell secretes numerous cytokines that helpto coordin
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ate the response of other immune cells?
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A. B cell r




B. TH cell r

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C. TC cell r




D. Platelets


Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivate
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d toxins can induce the synthesis of antitoxins in the blood of rabbits.These antitoxins
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(antibodies) are the basis of... r r r r




a. humoral immunity r




b. cell-mediated immunity r




c. antibiotic immunity r




d. phagocyte-mediated immunity - ANSWER: a. humoral immunity r r r r r r




Who of the following first discovered that some blood leukocytes could engulfdis
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ease-causing bacteria? r




a. von Behring
r




b. Meister
c. Metchnikoff
d. Ivanowski - ANSWER: c. Metchnikoff r r r r




Who is credited with developing a vaccine against chicken cholera?
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a. Koch
b. Pasteur
c. Jenner
d. Lister - ANSWER: b. Pasteur
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The concept that living organisms arise from nonliving material is called...
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a. biogenesis
b. cell theory r




c. spontaneous generation r



d. germ theory - ANSWER: c. spontaneous generation
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Protists contain all of the following forms of life EXCEPT...
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a. protozoa
b. fungi
c. slime molds r



d. algae - ANSWER: b. fungi
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Cells with a relatively simple cell morphology that do not have a true membrane-
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delimited nucleus are called...
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a. prokaryotes
b. eukaryotes
c. urkaryotes
d. nokaryotes - ANSWER: a. prokaryotes r r r r




The ribosomal RNA studies that led to the division of prokaryotic organisms intothe Ba
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cteria and the Archaea were begun by...
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a. Pasteur
b. Woese
c. Needham
d. Watson - ANSWER: b. Woese r r r r




In a search for new antibiotics, a previously unknown organism has been recoveredfro
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m the soil. It is nonmotile and is composed of long threadlike structures formed from nu
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cleated cells. It is not- r r r r


photosynthetic and absorbs its nutrients. This organism will most likely be classified a
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mong the... r




a. bacteria
b. archaea
c. eukaryotes (fungi) r



d. eukaryotes (protozoa) r




e. eukaryotes (algae) - ANSWER: c. eukaryotes (fungi) r r r r r r




If immersion oil was replaced with water, what would happen?
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a. The refractive index would increase, improving resolution
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b. The refractive index of water would be greater than air but less than oil,imp
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roving resolution less than oil.
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c. The refractive index of water would be less than that of air, decreasingreso
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lution.
d. There would be no difference. -
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ANSWER: b. The refractive index of waterwould be greater than air but less than
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oil, improving resolution less than oil.
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Prior to staining, smears of microorganisms are heat-fixed in order to...
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