©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 2
Exam Questions With Correct Answers
An organism of the genus Staphylococcus is ________, while an organism of the genus
Spirochaeta is ________.
A) spherical / rod shaped
B) rod shaped / coiled
C) spherical / coiled
D) coiled / spherical - answer✔C) spherical/coiled
Bacteria with type IV pili
A) possess tubular or stalk-like extensions of their cells.
B) likely exhibit twitching motility.
C) have capsules that promote dehydration.
D) live in aquatic environments. - answer✔B) likely exhibit twitching motility.
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.
The morphology of a cell influences its
A) motility.
B) metabolism.
C) surface-to-volume ratio.
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
D) motility and surface-to-volume ratio. - answer✔D) motility and surface-to-volume ratio.
Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios,
causing ________ nutrient exchange and growth rates.
A) lower / lower
B) lower / higher
C) higher / lower
D) higher / higher - answer✔D) higher/higher
The cytoplasmic membrane could best be described as
A) an impermeable barrier.
B) a passive conduit for intracellular transport.
C) a highly selective permeability barrier.
D) a rigid structure that protects the cell. - answer✔C) a highly selective permeability barrier.
Carrier-mediated transport is necessary when
A) diffusion will not allow adequate amounts of a substance to enter the cell.
B) movement into the cell is against a concentration gradient.
C) the level of nutrients in nature is very low.
D) nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion
is not possible. - answer✔D) nutrient concentration is very low in the environment, is higher
inside of the cell, or diffusion is not possible.
Nutrient transport requires energy because the nutrients must be transported into the cell against
a concentration gradient. The energy required for nutrient transport is supplied by
A) ATP.
B) the proton motive force.
C) phosphoenol pyruvate.
D) ATP, the proton motive force, or phosphoenol pyruvate. - answer✔A) ATP.
Using phase contrast microscopy on a wet mount of live cells, you observe motile bacilli moving
rapidly and randomly through the field of view, changing directions after a brief tumble and
taking off in a different direction. These cells are exhibiting ________ motility.
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
A) twitching
B) swimming
C) gliding
D) twitching or gliding - answer✔B) swimming
Which of the following statements is FALSE?
A) A flagellar protein subunit is flagellin.
B) In flagellar motion, the basal body acts as a motor.
C) Flagellar rotation generates ATP.
D) The hook is the wider region at the base of the flagellum. - answer✔C) Flagellar rotation
generates ATP.
Which of the following statements is TRUE?
A) Fimbriae are generally shorter and more numerous than flagella.
B) Fimbriae enable cells to stick to surfaces.
C) Pili serve as receptors and facilitate genetic exchange between prokaryotic cells.
D) Fibriae are usually shorter than flagella and enable cells to adhere to surfaces, whereas pili are
involved in genetic exchange. - answer✔D) Fibriae are usually shorter than flagella and enable
cells to adhere to surfaces, whereas pili are involved in genetic exchange.
Cellular inclusions in prokaryotic cells serve to
A) store energy rich compounds.
B) protect DNA.
C) position cells in the appropriate environment for survival.
D) store energy rich compounds and position cells in the appropriate environment for survival. -
answer✔D) store energy rich compounds and position cells in the appropriate environment for
survival.
A major function of prokaryotic gas vesicles is to
A) confer buoyancy on cells by decreasing their density.
B) serve as a reservoir for oxygen and carbon dioxide.
10/3/2024 9:54 PM
Brock Biology of Microorganisms Chapter 2
Exam Questions With Correct Answers
An organism of the genus Staphylococcus is ________, while an organism of the genus
Spirochaeta is ________.
A) spherical / rod shaped
B) rod shaped / coiled
C) spherical / coiled
D) coiled / spherical - answer✔C) spherical/coiled
Bacteria with type IV pili
A) possess tubular or stalk-like extensions of their cells.
B) likely exhibit twitching motility.
C) have capsules that promote dehydration.
D) live in aquatic environments. - answer✔B) likely exhibit twitching motility.
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.
The morphology of a cell influences its
A) motility.
B) metabolism.
C) surface-to-volume ratio.
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
D) motility and surface-to-volume ratio. - answer✔D) motility and surface-to-volume ratio.
Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios,
causing ________ nutrient exchange and growth rates.
A) lower / lower
B) lower / higher
C) higher / lower
D) higher / higher - answer✔D) higher/higher
The cytoplasmic membrane could best be described as
A) an impermeable barrier.
B) a passive conduit for intracellular transport.
C) a highly selective permeability barrier.
D) a rigid structure that protects the cell. - answer✔C) a highly selective permeability barrier.
Carrier-mediated transport is necessary when
A) diffusion will not allow adequate amounts of a substance to enter the cell.
B) movement into the cell is against a concentration gradient.
C) the level of nutrients in nature is very low.
D) nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion
is not possible. - answer✔D) nutrient concentration is very low in the environment, is higher
inside of the cell, or diffusion is not possible.
Nutrient transport requires energy because the nutrients must be transported into the cell against
a concentration gradient. The energy required for nutrient transport is supplied by
A) ATP.
B) the proton motive force.
C) phosphoenol pyruvate.
D) ATP, the proton motive force, or phosphoenol pyruvate. - answer✔A) ATP.
Using phase contrast microscopy on a wet mount of live cells, you observe motile bacilli moving
rapidly and randomly through the field of view, changing directions after a brief tumble and
taking off in a different direction. These cells are exhibiting ________ motility.
, ©SIRJOEL EXAM SOLUTIONS
10/3/2024 9:54 PM
A) twitching
B) swimming
C) gliding
D) twitching or gliding - answer✔B) swimming
Which of the following statements is FALSE?
A) A flagellar protein subunit is flagellin.
B) In flagellar motion, the basal body acts as a motor.
C) Flagellar rotation generates ATP.
D) The hook is the wider region at the base of the flagellum. - answer✔C) Flagellar rotation
generates ATP.
Which of the following statements is TRUE?
A) Fimbriae are generally shorter and more numerous than flagella.
B) Fimbriae enable cells to stick to surfaces.
C) Pili serve as receptors and facilitate genetic exchange between prokaryotic cells.
D) Fibriae are usually shorter than flagella and enable cells to adhere to surfaces, whereas pili are
involved in genetic exchange. - answer✔D) Fibriae are usually shorter than flagella and enable
cells to adhere to surfaces, whereas pili are involved in genetic exchange.
Cellular inclusions in prokaryotic cells serve to
A) store energy rich compounds.
B) protect DNA.
C) position cells in the appropriate environment for survival.
D) store energy rich compounds and position cells in the appropriate environment for survival. -
answer✔D) store energy rich compounds and position cells in the appropriate environment for
survival.
A major function of prokaryotic gas vesicles is to
A) confer buoyancy on cells by decreasing their density.
B) serve as a reservoir for oxygen and carbon dioxide.
