©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Brock Biology of Microorganisms Ch 1, 2, 3
Exam Questions With Correct Answers
****************************The terms "run" and "tumble" are generally associated with
A) eukaryotic cells.
B) nutrient transport.
C) chemotaxis.
D) clustering of certain rod-shaped bacteria. - answer✔C) chemotaxis.
**********************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
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
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
10/3/2024 9:54 PM
Brock Biology of Microorganisms Ch 1, 2, 3
Exam Questions With Correct Answers
****************************The terms "run" and "tumble" are generally associated with
A) eukaryotic cells.
B) nutrient transport.
C) chemotaxis.
D) clustering of certain rod-shaped bacteria. - answer✔C) chemotaxis.
**********************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
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
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
