BROCK BIOLOGY OF MICROORGANISMS
COMPREHENSIVE TEST PAPER QUESTIONS
AND ANSWERS VERIFIED GRADED A+
●● **********************Determine which outcome is LEAST
likely for a microorganism being motile.
A) avoidance of predation by bacteriovores
B) maintaining osmotic balance within a salt gradient
C) movement towards growth substrates
D) transfer of plasmids to progeny
Answer: D) transfer of plasmids to progeny
●● ***************The person who described the "wee animalcules"
was
A) Robert Hooke.
B) Antoni van Leeuwenhoek.
C) Louis Pasteur.
D) Ferdinand Cohn.
Answer: B) Antoni van Leeuwenhoek.
●● **********You have discovered a new microorganism, but you
want to know if it is a eukaryote or a prokaryote. To investigate this
question you prepare a slide with a simple stain and view it with a light
,microscope with a 40X objective lens and 10X ocular lens. You also
prepare a control slide using Saccharomyces cerevisiae (a unicellular
eukaryote). You can see the cells on your control slide, but you don't see
cells when you look at your unknown microorganism. What can you
conclude from this experiment?
A) The experiment failed to visualize the organism because the stain
killed it.
B) Your new unknown microorganism is probably a virus.
C) The cells of the new unknown microorganism may be too small to
see with the objective and ocular lenses you used.
D) The new unknown microorganism is probably an archaeon.
Answer: C) The cells of the new unknown microorganism may be too
small to see with the objective and ocular lenses you used.
●● *******************You are given an electron micrograph of a
bacterial cell. In the micrograph you can clearly see three thin layers of
different densities surrounding the cell. Based on the micrograph, you
can infer that this cell is ________ and would appear ________ after
application of the Gram stain procedure.
A) gram-positive / purple
B) gram-negative / pink
C) gram-positive / pink
D) gram-negative / purple
Answer: B) gram-negative / pink
, ●● ***********Which of the following is/are characteristic of ALL
cellular organisms?
A) communication
B) evolution
C) motility
D) communication, evolution, and motility
Answer: B) evolution
●● ***********************In gram-positive Bacteria, the cell walls
are composed mainly of thick ________ layers.
A) protein
B) poly-β-hydroxybutryic acid (PHB)
C) lipopolysaccharides (LPS)
D) peptidoglycan
Answer: D) peptidoglycan
●● ************************************The lipopolysaccharide
(LPS) layer is found ONLY in the cell walls of
A) gram-positive Bacteria.
B) gram-negative Bacteria.
C) Archaea.
D) Eukarya.
Answer: B) gram-negative Bacteria.
COMPREHENSIVE TEST PAPER QUESTIONS
AND ANSWERS VERIFIED GRADED A+
●● **********************Determine which outcome is LEAST
likely for a microorganism being motile.
A) avoidance of predation by bacteriovores
B) maintaining osmotic balance within a salt gradient
C) movement towards growth substrates
D) transfer of plasmids to progeny
Answer: D) transfer of plasmids to progeny
●● ***************The person who described the "wee animalcules"
was
A) Robert Hooke.
B) Antoni van Leeuwenhoek.
C) Louis Pasteur.
D) Ferdinand Cohn.
Answer: B) Antoni van Leeuwenhoek.
●● **********You have discovered a new microorganism, but you
want to know if it is a eukaryote or a prokaryote. To investigate this
question you prepare a slide with a simple stain and view it with a light
,microscope with a 40X objective lens and 10X ocular lens. You also
prepare a control slide using Saccharomyces cerevisiae (a unicellular
eukaryote). You can see the cells on your control slide, but you don't see
cells when you look at your unknown microorganism. What can you
conclude from this experiment?
A) The experiment failed to visualize the organism because the stain
killed it.
B) Your new unknown microorganism is probably a virus.
C) The cells of the new unknown microorganism may be too small to
see with the objective and ocular lenses you used.
D) The new unknown microorganism is probably an archaeon.
Answer: C) The cells of the new unknown microorganism may be too
small to see with the objective and ocular lenses you used.
●● *******************You are given an electron micrograph of a
bacterial cell. In the micrograph you can clearly see three thin layers of
different densities surrounding the cell. Based on the micrograph, you
can infer that this cell is ________ and would appear ________ after
application of the Gram stain procedure.
A) gram-positive / purple
B) gram-negative / pink
C) gram-positive / pink
D) gram-negative / purple
Answer: B) gram-negative / pink
, ●● ***********Which of the following is/are characteristic of ALL
cellular organisms?
A) communication
B) evolution
C) motility
D) communication, evolution, and motility
Answer: B) evolution
●● ***********************In gram-positive Bacteria, the cell walls
are composed mainly of thick ________ layers.
A) protein
B) poly-β-hydroxybutryic acid (PHB)
C) lipopolysaccharides (LPS)
D) peptidoglycan
Answer: D) peptidoglycan
●● ************************************The lipopolysaccharide
(LPS) layer is found ONLY in the cell walls of
A) gram-positive Bacteria.
B) gram-negative Bacteria.
C) Archaea.
D) Eukarya.
Answer: B) gram-negative Bacteria.
