STRAIGHTERLINE MICROBIOLOGY ACTUAL
EXAMPREP 2026 SOLVED QUESTIONS WITH
FULL SOLUTION
◉ 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
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...
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.
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
EXAMPREP 2026 SOLVED QUESTIONS WITH
FULL SOLUTION
◉ 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
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...
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.
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
