MICROBIOLOGY STRAIGHTERLINE
(QUIZZES) WITH 195 QUESTIONS AND
CORRECT ANSWERS RATED
A+2026/2027
Protists contain all of the following forms of life EXCEPT...
a. protozoa
b. fungi
c. slime molds
d. algae
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
a. prokaryotes
The ribosomal RNA studies that led to the division of prokaryotic organisms into
the Bacteria and the Archaea were begun by...
a. Pasteur
b. Woese
c. Needham
d. Watson
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)
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.
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.
c. attach it firmly to the slide.
d. create small pores in cells that facilitates binding of stain to cell structures.
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
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
b. more; darker
In the Gram-staining procedure, the mordant is...
a. iodine.
b. safranin.
c. crystal violet.
d. alcohol.
a. iodine.
Acid-fast organisms such as Mycobacterium tuberculosis contain lipids
constructed from ________________in their cell walls.
a. proteins
b. carbohydrates
c. mycolic acids
d. peptidoglycan
c. mycolic acids
Fatty acid methyl ester (FAME) analysis is particularly important in public health
because in this application, microbiologists seek to identify specific microbial
, pathogens in ______.
a. food and water
b. patient samples
c. genomic analysis
d. genetic diseases
a. food and water
Genomic DNA sequences seem to support the idea that the first eukaryotic cell
arose from within the _____ lineage.
a. archaeal
b. bacterial
c. viral
d. last universal common ancestor (LUCA)
a. archaeal
An unrooted tree containing four unrelated species can become rooted by adding
a. a descendant group related to two of the species.
b. an unrelated outgroup.
c. a distantly related outgroup.
d. a descendant related to only one of the species.
c. a distantly related outgroup.
A general term used to describe groups based on mutual similarity or
evolutionary relatedness is ______.
a. class
b. taxa
c. system
d. group
b. taxa
(QUIZZES) WITH 195 QUESTIONS AND
CORRECT ANSWERS RATED
A+2026/2027
Protists contain all of the following forms of life EXCEPT...
a. protozoa
b. fungi
c. slime molds
d. algae
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
a. prokaryotes
The ribosomal RNA studies that led to the division of prokaryotic organisms into
the Bacteria and the Archaea were begun by...
a. Pasteur
b. Woese
c. Needham
d. Watson
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)
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.
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.
c. attach it firmly to the slide.
d. create small pores in cells that facilitates binding of stain to cell structures.
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
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
b. more; darker
In the Gram-staining procedure, the mordant is...
a. iodine.
b. safranin.
c. crystal violet.
d. alcohol.
a. iodine.
Acid-fast organisms such as Mycobacterium tuberculosis contain lipids
constructed from ________________in their cell walls.
a. proteins
b. carbohydrates
c. mycolic acids
d. peptidoglycan
c. mycolic acids
Fatty acid methyl ester (FAME) analysis is particularly important in public health
because in this application, microbiologists seek to identify specific microbial
, pathogens in ______.
a. food and water
b. patient samples
c. genomic analysis
d. genetic diseases
a. food and water
Genomic DNA sequences seem to support the idea that the first eukaryotic cell
arose from within the _____ lineage.
a. archaeal
b. bacterial
c. viral
d. last universal common ancestor (LUCA)
a. archaeal
An unrooted tree containing four unrelated species can become rooted by adding
a. a descendant group related to two of the species.
b. an unrelated outgroup.
c. a distantly related outgroup.
d. a descendant related to only one of the species.
c. a distantly related outgroup.
A general term used to describe groups based on mutual similarity or
evolutionary relatedness is ______.
a. class
b. taxa
c. system
d. group
b. taxa
