BIOL 250 Bacteriology Final Exam Review UPDATED ACTUAL Questions and
CORRECT Answers
CELL STRUCTURE & FUNCTION (Ch. 3) Slime layer
3 multiple choice options
A bacterium survives desiccation on a dry hospital curtain
for weeks. Which external structure most directly explains
this?
CELL STRUCTURE & FUNCTION (Ch. 3) Inability to anchor flagellum into the cell wall/membrane
3 multiple choice options
A Gram-negative bacterium is found to have impaired
motility due to a defective basal body. What immediate
effect would this cause?
CELL STRUCTURE & FUNCTION (Ch. 3) Amphitrichous
A researcher isolates a bacterium with tufts of flagella at
both poles. How should she classify its flagella?
3 multiple choice options
CELL STRUCTURE & FUNCTION (Ch. 3) Spirochetes
3 multiple choice options
A pathogen moves using an axial filament that lets it
“corkscrew” through tissues. Identify the bacterial
lineage.
CELL STRUCTURE & FUNCTION (Ch. 3) Pilus
3 multiple choice options
Which structure would directly interfere with bacterial
conjugation if destroyed?
CELL STRUCTURE & FUNCTION (Ch. 3) Staphylococcus
3 multiple choice options
A patient infection shows clusters of Gram-positive cocci.
What cellular arrangement does this suggest?
CELL STRUCTURE & FUNCTION (Ch. 3) Weakening of the cell wall → cell lysis
3 multiple choice options
A strain of bacteria loses its ability to cross-link NAG and
NAM. What is the most likely outcome?
, CELL STRUCTURE & FUNCTION (Ch. 3) Peptidoglycan cell wall
3 multiple choice options
A bacterial culture begins to lyse after exposure to an
experimental drug targeting cross-linking between NAM
and NAG. Which bacterial structure is being
compromised?
CELL STRUCTURE & FUNCTION (Ch. 3) Gram-positive
3 multiple choice options
A bacterium whose thick peptidoglycan retains crystal
violet stain is classified as ___ _.
CELL STRUCTURE & FUNCTION (Ch. 3) Inability to anchor the thick cell wall to the membrane (Gram-positive instability)
2 multiple choice options
A bacterium loses its ability to produce teichoic acids.
Which direct consequence would you expect?
CELL STRUCTURE & FUNCTION (Ch. 3) Form biofilms
3 multiple choice options
A bacterium lacking a glycocalyx is unable to:
CELL STRUCTURE & FUNCTION (Ch. 3) Motility entirely
3 multiple choice options
A new antimicrobial drug prevents proper hook–filament
attachment of the flagellum. Which ability is lost?
CELL STRUCTURE & FUNCTION (Ch. 3) Staphylococcus
3 multiple choice options
A researcher isolates a microbe that survives in salt-rich
environments and forms grapelike clusters. Which genus
is the best match?
CELL STRUCTURE & FUNCTION (Ch. 3) Spirochete
3 multiple choice options
A pathogen originally identified as a spirillum is found to
have endoflagella and “drills” through tissues. What’s the
correct reclassification?
CELL STRUCTURE & FUNCTION (Ch. 3) Mycoplasma
3 multiple choice options
A bacterial species lacks a cell wall entirely. Which genus
does this resemble?
CELL STRUCTURE & FUNCTION (Ch. 3) Eukaryotic
3 multiple choice options
A cell has sterols in its membranes and 80S ribosomes. It
must be:
MICROSCOPY & STAINING (Ch. 4) Empty magnification
3 multiple choice options
A student increases magnification but the image doesn’t
become clearer. This is an example of:
CORRECT Answers
CELL STRUCTURE & FUNCTION (Ch. 3) Slime layer
3 multiple choice options
A bacterium survives desiccation on a dry hospital curtain
for weeks. Which external structure most directly explains
this?
CELL STRUCTURE & FUNCTION (Ch. 3) Inability to anchor flagellum into the cell wall/membrane
3 multiple choice options
A Gram-negative bacterium is found to have impaired
motility due to a defective basal body. What immediate
effect would this cause?
CELL STRUCTURE & FUNCTION (Ch. 3) Amphitrichous
A researcher isolates a bacterium with tufts of flagella at
both poles. How should she classify its flagella?
3 multiple choice options
CELL STRUCTURE & FUNCTION (Ch. 3) Spirochetes
3 multiple choice options
A pathogen moves using an axial filament that lets it
“corkscrew” through tissues. Identify the bacterial
lineage.
CELL STRUCTURE & FUNCTION (Ch. 3) Pilus
3 multiple choice options
Which structure would directly interfere with bacterial
conjugation if destroyed?
CELL STRUCTURE & FUNCTION (Ch. 3) Staphylococcus
3 multiple choice options
A patient infection shows clusters of Gram-positive cocci.
What cellular arrangement does this suggest?
CELL STRUCTURE & FUNCTION (Ch. 3) Weakening of the cell wall → cell lysis
3 multiple choice options
A strain of bacteria loses its ability to cross-link NAG and
NAM. What is the most likely outcome?
, CELL STRUCTURE & FUNCTION (Ch. 3) Peptidoglycan cell wall
3 multiple choice options
A bacterial culture begins to lyse after exposure to an
experimental drug targeting cross-linking between NAM
and NAG. Which bacterial structure is being
compromised?
CELL STRUCTURE & FUNCTION (Ch. 3) Gram-positive
3 multiple choice options
A bacterium whose thick peptidoglycan retains crystal
violet stain is classified as ___ _.
CELL STRUCTURE & FUNCTION (Ch. 3) Inability to anchor the thick cell wall to the membrane (Gram-positive instability)
2 multiple choice options
A bacterium loses its ability to produce teichoic acids.
Which direct consequence would you expect?
CELL STRUCTURE & FUNCTION (Ch. 3) Form biofilms
3 multiple choice options
A bacterium lacking a glycocalyx is unable to:
CELL STRUCTURE & FUNCTION (Ch. 3) Motility entirely
3 multiple choice options
A new antimicrobial drug prevents proper hook–filament
attachment of the flagellum. Which ability is lost?
CELL STRUCTURE & FUNCTION (Ch. 3) Staphylococcus
3 multiple choice options
A researcher isolates a microbe that survives in salt-rich
environments and forms grapelike clusters. Which genus
is the best match?
CELL STRUCTURE & FUNCTION (Ch. 3) Spirochete
3 multiple choice options
A pathogen originally identified as a spirillum is found to
have endoflagella and “drills” through tissues. What’s the
correct reclassification?
CELL STRUCTURE & FUNCTION (Ch. 3) Mycoplasma
3 multiple choice options
A bacterial species lacks a cell wall entirely. Which genus
does this resemble?
CELL STRUCTURE & FUNCTION (Ch. 3) Eukaryotic
3 multiple choice options
A cell has sterols in its membranes and 80S ribosomes. It
must be:
MICROSCOPY & STAINING (Ch. 4) Empty magnification
3 multiple choice options
A student increases magnification but the image doesn’t
become clearer. This is an example of:
