AND 100% CORRECT WELL DETAILED
Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins
can induce the synthesis of antitoxins in the blood of rabbits. These antitoxins (antibodies)
are the basis of...
a. humoral immunity
b. cell-mediated immunity
c. antibiotic immunity
d. phagocyte-mediated immunity - ANSWER a. humoral immunity
Who of the following first discovered that some blood leukocytes could engulf disease-
causing bacteria?
a. von Behring
b. Meister
c. Metchnikoff
d. Ivanowski - ANSWER c. Metchnikoff
Who is credited with developing a vaccine against chicken cholera?
a. Koch
b. Pasteur
1
,c. Jenner
d. Lister - ANSWER b. Pasteur
The concept that living organisms arise from nonliving material is called...
a. biogenesis
b. cell theory
c. spontaneous generation
d. germ theory - ANSWER c. spontaneous generation
Protists contain all of the following forms of life EXCEPT...
a. protozoa
b. fungi
c. slime molds
d. algae - ANSWER b. fungi
Cells with a relatively simple cell morphology that do not have a true membrane-delimited
nucleus are called...
a. prokaryotes
b. eukaryotes
c. urkaryotes
d. nokaryotes - ANSWER a. prokaryotes
The ribosomal RNA studies that led to the division of prokaryotic organisms into the Bacteria
and the Archaea were begun by...
2
,a. Pasteur
b. Woese
c. Needham
d. Watson - ANSWER b. Woese
In a search for new antibiotics, a previously unknown organism has been recovered from the
soil. It is nonmotile and is composed of long threadlike structures formed from nucleated
cells. It is not-photosynthetic and absorbs its nutrients. This organism will most likely be
classified among the...
a. bacteria
b. archaea
c. eukaryotes (fungi)
d. eukaryotes (protozoa)
e. eukaryotes (algae) - ANSWER c. eukaryotes (fungi)
If immersion oil was replaced with water, what would happen?
a. The refractive index would increase, improving resolution
b. The refractive index of water would be greater than air but less than oil, improving
resolution less than oil.
c. The refractive index of water would be less than that of air, decreasing resolution.
d. There would be no difference. - ANSWER b. The refractive index of water would be
greater than air but less than oil, improving resolution less than oil.
Prior to staining, smears of microorganisms are heat-fixed in order to...
a. allow eventual visualization of internal structures.
b. ensure removal of dust particles from the slide surface.
3
, c. attach it firmly to the slide.
d. create small pores in cells that facilitates binding of stain to cell structures. -
ANSWER c. attach it firmly to the slide.
If the decolorizer is left on too long in the Gram-staining procedure, gram-positive organisms
will be stained __________ and gram-negative organisms will be stained __________.
a. purple; blue
b. purple; colorless
c. purple; pink
d. pink; pink - ANSWER d. pink; pink
Regions of a specimen with higher electron density scatter ___________ electrons and,
therefore, appear __________ in the image projected onto the screen of a transmission
electron microscope.
a. more; lighter
b. more; darker
c. fewer; darker
d. fewer; lighter - ANSWER b. more; darker
In the Gram-staining procedure, the mordant is...
a. iodine.
b. safranin.
c. crystal violet.
d. alcohol. - ANSWER a. iodine.
4
Studies by Emil von Behring and Shibasaburo Kitasato demonstrated that inactivated toxins
can induce the synthesis of antitoxins in the blood of rabbits. These antitoxins (antibodies)
are the basis of...
a. humoral immunity
b. cell-mediated immunity
c. antibiotic immunity
d. phagocyte-mediated immunity - ANSWER a. humoral immunity
Who of the following first discovered that some blood leukocytes could engulf disease-
causing bacteria?
a. von Behring
b. Meister
c. Metchnikoff
d. Ivanowski - ANSWER c. Metchnikoff
Who is credited with developing a vaccine against chicken cholera?
a. Koch
b. Pasteur
1
,c. Jenner
d. Lister - ANSWER b. Pasteur
The concept that living organisms arise from nonliving material is called...
a. biogenesis
b. cell theory
c. spontaneous generation
d. germ theory - ANSWER c. spontaneous generation
Protists contain all of the following forms of life EXCEPT...
a. protozoa
b. fungi
c. slime molds
d. algae - ANSWER b. fungi
Cells with a relatively simple cell morphology that do not have a true membrane-delimited
nucleus are called...
a. prokaryotes
b. eukaryotes
c. urkaryotes
d. nokaryotes - ANSWER a. prokaryotes
The ribosomal RNA studies that led to the division of prokaryotic organisms into the Bacteria
and the Archaea were begun by...
2
,a. Pasteur
b. Woese
c. Needham
d. Watson - ANSWER b. Woese
In a search for new antibiotics, a previously unknown organism has been recovered from the
soil. It is nonmotile and is composed of long threadlike structures formed from nucleated
cells. It is not-photosynthetic and absorbs its nutrients. This organism will most likely be
classified among the...
a. bacteria
b. archaea
c. eukaryotes (fungi)
d. eukaryotes (protozoa)
e. eukaryotes (algae) - ANSWER c. eukaryotes (fungi)
If immersion oil was replaced with water, what would happen?
a. The refractive index would increase, improving resolution
b. The refractive index of water would be greater than air but less than oil, improving
resolution less than oil.
c. The refractive index of water would be less than that of air, decreasing resolution.
d. There would be no difference. - ANSWER b. The refractive index of water would be
greater than air but less than oil, improving resolution less than oil.
Prior to staining, smears of microorganisms are heat-fixed in order to...
a. allow eventual visualization of internal structures.
b. ensure removal of dust particles from the slide surface.
3
, c. attach it firmly to the slide.
d. create small pores in cells that facilitates binding of stain to cell structures. -
ANSWER c. attach it firmly to the slide.
If the decolorizer is left on too long in the Gram-staining procedure, gram-positive organisms
will be stained __________ and gram-negative organisms will be stained __________.
a. purple; blue
b. purple; colorless
c. purple; pink
d. pink; pink - ANSWER d. pink; pink
Regions of a specimen with higher electron density scatter ___________ electrons and,
therefore, appear __________ in the image projected onto the screen of a transmission
electron microscope.
a. more; lighter
b. more; darker
c. fewer; darker
d. fewer; lighter - ANSWER b. more; darker
In the Gram-staining procedure, the mordant is...
a. iodine.
b. safranin.
c. crystal violet.
d. alcohol. - ANSWER a. iodine.
4
