[BIOL 250] Lab Quiz #1 [EXP. #1, 2, 3,
5, & 6] With Solved Solutions 2025-
2026 Updated.
EXP. #1: - Answer
Aseptic technique - Answer Procedures that prevent microbes from getting where they do
not belong (contamination). This includes microbes from the environment contami- nating your
lab area as well as any microbes under study contaminating you or your work area.
Bibulous paper - Answer Specially prepared blotting paper that contains a minimum of loose
paper fibers.
Eukaryotic Cells - Answer with a true nucleus and paired chromosomes.
Parfocal - Answer Feature of most microscopes that sets the focal point of all objective
lenses at the same location in space
Prokaryotic Cells - Answer with no true nucleus (membrane covered, paired chromosomes),
with only one circular chromosome.
Resolution - Answer The ability to see a small object clearly under the microscope
(technically, minimal distance at which two adjacent small objects can be distinguished as
separate).
Rheostat - Answer Device that controls the amount of electrical current and thus the
amount of light emanating from a bulb.
EXP. #2: - Answer
Agar - Answer Solidifying agent used for growth media derived from seaweed.
Agar deep - Answer Growth medium in a test tube allowed to solidify as the tube sits in a
test-tube rack.
Agar plate - Answer Solidified growth medium in a lid-covered, flat dish.
5, & 6] With Solved Solutions 2025-
2026 Updated.
EXP. #1: - Answer
Aseptic technique - Answer Procedures that prevent microbes from getting where they do
not belong (contamination). This includes microbes from the environment contami- nating your
lab area as well as any microbes under study contaminating you or your work area.
Bibulous paper - Answer Specially prepared blotting paper that contains a minimum of loose
paper fibers.
Eukaryotic Cells - Answer with a true nucleus and paired chromosomes.
Parfocal - Answer Feature of most microscopes that sets the focal point of all objective
lenses at the same location in space
Prokaryotic Cells - Answer with no true nucleus (membrane covered, paired chromosomes),
with only one circular chromosome.
Resolution - Answer The ability to see a small object clearly under the microscope
(technically, minimal distance at which two adjacent small objects can be distinguished as
separate).
Rheostat - Answer Device that controls the amount of electrical current and thus the
amount of light emanating from a bulb.
EXP. #2: - Answer
Agar - Answer Solidifying agent used for growth media derived from seaweed.
Agar deep - Answer Growth medium in a test tube allowed to solidify as the tube sits in a
test-tube rack.
Agar plate - Answer Solidified growth medium in a lid-covered, flat dish.
