Microbiology Straighterline Exam 2024 Questions and Answers.

Microbiology Straighterline Exam 2024
Questions and Answers



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




a. humoral immunity
b b




b. cell-mediated immunity
b b




c. antibiotic immunity
b b




d. phagocyte-mediated immunity - answer-a. humoral immunity
b b b b b b




Who of the following first discovered that some blood leukocytes could engulf disease-
b b b b b b b b b b b b




causing bacteria? b




a. von Behring
b b




b. Meister
b




c. Metchnikoff
b




d. Ivanowski - answer-c. Metchnikoff
b b b b




Who is credited with developing a vaccine against chicken cholera?
b b b b b b b b b




a. Koch
b




b. Pasteur
b




c. Jenner
b

,d. Lister - answer-b. Pasteur
b b b b




The concept that living organisms arise from nonliving material is called...
b b b b b b b b b b




a. biogenesis
b




b. cell theory
b b




c. spontaneous generation
b b




d. germ theory - answer-c. spontaneous generation
b b b b b b




Protists contain all of the following forms of life EXCEPT...
b b b b b b b b b




a. protozoa
b




b. fungi
b




c. slime molds
b b




d. algae - answer-b. fungi
b b b b




Cells with a relatively simple cell morphology that do not have a true membrane-
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delimited nucleus are called... b b b




a. prokaryotes
b




b. eukaryotes
b




c. urkaryotes
b




d. nokaryotes - answer-a. prokaryotes
b b b b




The ribosomal RNA studies that led to the division of prokaryotic organisms into the
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b Bacteria and the Archaea were begun by...
b b b b b b




a. Pasteur
b




b. Woese
b




c. Needham
b




d. Watson - answer-b. Woese
b b b b

,In a search for new antibiotics, a previously unknown organism has been recovered from
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b the soil. It is nonmotile and is composed of long threadlike structures formed from
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b nucleated cells. It is not-photosynthetic and absorbs its nutrients. This organism will most
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b likely be classified among the...
b b b b




a. bacteria
b




b. archaea
b




c. eukaryotes (fungi)
b b




d. eukaryotes (protozoa)
b b




e. eukaryotes (algae) - answer-c. eukaryotes (fungi)
b b b b b b




If immersion oil was replaced with water, what would happen?
b b b b b b b b b




a. The refractive index would increase, improving resolution
b b b b b b b




b. The refractive index of water would be greater than air but less than oil, improving
b b b b b b b b b b b b b b b




b resolution less than oil. b b b




c. The refractive index of water would be less than that of air, decreasing resolution.
b b b b b b b b b b b b b b




d. There would be no difference. - answer-b. The refractive index of water would be
b b b b b b b b b b b b b b




b greater than air but less than oil, improving resolution less than oil.
b b b b b b b b b b b




Prior to staining, smears of microorganisms are heat-fixed in order to...
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a. allow eventual visualization of internal structures.
b b b b b b




b. ensure removal of dust particles from the slide surface.
b b b b b b b b b




c. attach it firmly to the slide.
b b b b b b




d. create small pores in cells that facilitates binding of stain to cell structures. - answer-c.
b b b b b b b b b b b b b b b




b attach it firmly to the slide.
b b b b b




If the decolorizer is left on too long in the Gram-staining procedure, gram-positive
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b organisms will be stained __________ and gram-negative organisms will be stained __________.
b b b b b b b b b b b

, a. purple; blue
b b




b. purple; colorless
b b




c. purple; pink
b b




d. pink; pink - answer-d. pink; pink
b b b b b b




Regions of a specimen with higher electron density scatter ___________ electrons and,
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b therefore, appear __________ in the image projected onto the screen of a transmission
b b b b b b b b b b b b




b electron microscope. b




a. more; lighter
b b




b. more; darker
b b




c. fewer; darker
b b




d. fewer; lighter - answer-b. more; darker
b b b b b b




In the Gram-staining procedure, the mordant is...
b b b b b b




a. iodine.
b




b. safranin.
b




c. crystal violet.
b b




d. alcohol. - answer-a. iodine.
b b b b




Acid-fast organisms such as Mycobacterium tuberculosis contain lipids constructed from
b b b b b b b b b




b ________________in their cell walls. b b b




a. proteins
b




b. carbohydrates
b




c. mycolic acids
b b




d. peptidoglycan - answer-c. mycolic acids
b b b b b