General Microbiology Lab Exam 1 Questions
with Correct Answers 2026 Update
Bacillis Bacteria - CORRECT ANSWER -Rod Shaped, Move easily (tail)
Cocci Bacteria - CORRECT ANSWER -Coccus,
Not mobile.
Streptococcus - CORRECT ANSWER -Linear Row of coccus
Diplococcus - CORRECT ANSWER -Two linear cells of coccus
Staphylocci - CORRECT ANSWER -Cells grouped together of coccus
Ubiquity of bacteria - CORRECT ANSWER -Most are not pathogens... but actually normal flora
and beneficial and essential to higher organisms.
Immersion Oil - CORRECT ANSWER -Oil forms a continuous lens system that limits the loss of
light due to retraction.
Colony - CORRECT ANSWER -is a visible mass of cells usually resulting from a division of a single
cell and number can exceed one billion from a single cell.
Agar and petri dish - CORRECT ANSWER -Agar media were easily manipulated, and could be
added to rich broths to form a solid medium on which isolated colonies would develop.
Petri dish protected the nutrient surface.
, Transferring broth to agar plate - CORRECT ANSWER -Flame loops, culture tubes, raise the lid of
the petri dish.
Heat-fix slides.
Aseptic Technique Rules - CORRECT ANSWER -Lab techniques:
Disinfecting work area
Flaming transfer tools
Flaming culture tubes
Used gloved hands
Smear Preparation - CORRECT ANSWER -Best to have one thin layer.
Used:
staphylococcus,
streptococcus,
and bacillus
Gram Positive: - CORRECT ANSWER -Thick protein traps staining Peptiodoglycan
Purple color
Gram Stains: - CORRECT ANSWER -Primary stain: Crystal Violet
Mordant: Gram's Iodine
Counterstain: Safranin
Decolorization: Alcohol
Gram stain is an example of a differential stain.
Used:
with Correct Answers 2026 Update
Bacillis Bacteria - CORRECT ANSWER -Rod Shaped, Move easily (tail)
Cocci Bacteria - CORRECT ANSWER -Coccus,
Not mobile.
Streptococcus - CORRECT ANSWER -Linear Row of coccus
Diplococcus - CORRECT ANSWER -Two linear cells of coccus
Staphylocci - CORRECT ANSWER -Cells grouped together of coccus
Ubiquity of bacteria - CORRECT ANSWER -Most are not pathogens... but actually normal flora
and beneficial and essential to higher organisms.
Immersion Oil - CORRECT ANSWER -Oil forms a continuous lens system that limits the loss of
light due to retraction.
Colony - CORRECT ANSWER -is a visible mass of cells usually resulting from a division of a single
cell and number can exceed one billion from a single cell.
Agar and petri dish - CORRECT ANSWER -Agar media were easily manipulated, and could be
added to rich broths to form a solid medium on which isolated colonies would develop.
Petri dish protected the nutrient surface.
, Transferring broth to agar plate - CORRECT ANSWER -Flame loops, culture tubes, raise the lid of
the petri dish.
Heat-fix slides.
Aseptic Technique Rules - CORRECT ANSWER -Lab techniques:
Disinfecting work area
Flaming transfer tools
Flaming culture tubes
Used gloved hands
Smear Preparation - CORRECT ANSWER -Best to have one thin layer.
Used:
staphylococcus,
streptococcus,
and bacillus
Gram Positive: - CORRECT ANSWER -Thick protein traps staining Peptiodoglycan
Purple color
Gram Stains: - CORRECT ANSWER -Primary stain: Crystal Violet
Mordant: Gram's Iodine
Counterstain: Safranin
Decolorization: Alcohol
Gram stain is an example of a differential stain.
Used:
