BIO 250L LAB 8 2026 COMPLETE LAB REVIEW
QUESTIONS AND ANSWERS VERIFIED GRADED
A+
◉ strepto. Answer: chain of cells
◉ vibrio. Answer: curved rod shape, like a comma
◉ Monotrichous. Answer: single flagellum
◉ Lophotrichous. Answer: more than one flagellum emerging from
the same site
◉ Amphitrichous. Answer: flagella at both poles of the cell
◉ Peritrichous. Answer: flagella dispersed randomly over the
surface of the cell
◉ Motility stab. Answer: - cool inoculating wire obtains inoculum
from a pure culture
- needle is stabbed into motility stab media approximately two-
thirds of the depth of the media
,- tube is incubated for approximately 1-2 labs
- A non-motile organism will have a clearly defined edge as it grows
on the stab line.
- The cloudier the tube, the more motile the inoculum.
◉ Disadvantages of hanging drop procedure. Answer: - Brownian
movement can be mistaken for motility
- too dangerous to use with a pathenogenic organism
◉ Advantages of hanging drop. Answer: - shows motility of organism
- uses less light than a stained slide
-shows flagella in bacteria cells
-uses depression slide
◉ Simple microscope. Answer: one objective lens
◉ compound microscope. Answer: more than one objective lens
◉ Monocular. Answer: one ocular lens
◉ binocular. Answer: two ocular lens
, ◉ What type of alcohol is used to clean lenses. Answer: ethyl alcohol
◉ Arm. Answer: part of the frame, used for carrying the microscope
◉ base. Answer: part of the frame, provides support for the
microscope
◉ stage. Answer: flat platform on which the slide rests
◉ body tube. Answer: holds the magnifying lenses through which
the specimen is viewed
◉ nosepiece. Answer: holds the objective lenses which 'click' into
place as they are rotated
◉ ocular lens. Answer: eyepiece through which the specimen in
viewed
◉ objective lenses. Answer: magnifying lenses that are nearest the
specimen;
◉ condenser. Answer: contains lenses that collect and concentrate
the light, directing it upward through the specimen
QUESTIONS AND ANSWERS VERIFIED GRADED
A+
◉ strepto. Answer: chain of cells
◉ vibrio. Answer: curved rod shape, like a comma
◉ Monotrichous. Answer: single flagellum
◉ Lophotrichous. Answer: more than one flagellum emerging from
the same site
◉ Amphitrichous. Answer: flagella at both poles of the cell
◉ Peritrichous. Answer: flagella dispersed randomly over the
surface of the cell
◉ Motility stab. Answer: - cool inoculating wire obtains inoculum
from a pure culture
- needle is stabbed into motility stab media approximately two-
thirds of the depth of the media
,- tube is incubated for approximately 1-2 labs
- A non-motile organism will have a clearly defined edge as it grows
on the stab line.
- The cloudier the tube, the more motile the inoculum.
◉ Disadvantages of hanging drop procedure. Answer: - Brownian
movement can be mistaken for motility
- too dangerous to use with a pathenogenic organism
◉ Advantages of hanging drop. Answer: - shows motility of organism
- uses less light than a stained slide
-shows flagella in bacteria cells
-uses depression slide
◉ Simple microscope. Answer: one objective lens
◉ compound microscope. Answer: more than one objective lens
◉ Monocular. Answer: one ocular lens
◉ binocular. Answer: two ocular lens
, ◉ What type of alcohol is used to clean lenses. Answer: ethyl alcohol
◉ Arm. Answer: part of the frame, used for carrying the microscope
◉ base. Answer: part of the frame, provides support for the
microscope
◉ stage. Answer: flat platform on which the slide rests
◉ body tube. Answer: holds the magnifying lenses through which
the specimen is viewed
◉ nosepiece. Answer: holds the objective lenses which 'click' into
place as they are rotated
◉ ocular lens. Answer: eyepiece through which the specimen in
viewed
◉ objective lenses. Answer: magnifying lenses that are nearest the
specimen;
◉ condenser. Answer: contains lenses that collect and concentrate
the light, directing it upward through the specimen
