MCB 2610 Lab Practical Exam Questions
and Answers
The __________ method is a quick and easy way to isolate bacteria - ANSWER-streak plate
in what orientation do you incubate the plates after they have been streaked? - ANSWER-agar half
on top
what must you do to the loop before every use? - ANS...
which of the following is an indirect mode of transmission? - ANSWER✔✔-cell phone
T/F: When making a smear of the culture, you heat fix the slide before air drying it completely -
ANSWER✔✔-False
T/F: Washing your hands is the last thing you do when you leave the lab - ANSWER✔✔-True
What is the magnification value of the ONLY objective lens that should come in contact with immersion
oil? - ANSWER✔✔-100x
Pertaining to the Gram Stain, cells that retain crystal violet & appear purple are said to be __________ -
ANSWER✔✔-Gram positive
T/F: your name, the date, and sample information goes on the lid of the agar dish - ANSWER✔✔-False
Pertaining to the Gram Stain, cells that do not retain crystal violet & appear pink are said to be Gram
________ - ANSWER✔✔-Negative
T/F: heat used during staining does not cause sporulation - ANSWER✔✔-True
T/F: Malachite green stains the endospores green, while the safranin stains vegetative cells pink -
ANSWER✔✔-True
T/F: a vegetative cell is formed in response to certain environmental conditions such as depletion of
nutrients - ANSWER✔✔-False
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