Why are you not permitted to bring food into the laboratory?
Consuming food in the lab creates opportunities for students to accidentally ingest microbes
You must not use the coarse focus adjustment when the oil immersion objective is being used, but why not?
Since the oil immersion lens is so close to the stage, and the movements caused by the coarse focus adjustment are so great, a collision between lens and specimen may occur
What does heat-fixing a smear on a slide accomplish?
A) Heat-fixing kills the microbes on the slide
B) Heat-fixing adheres the cells to the slide
C) Heat fixing makes it easier for stains to penetrate the cells
D) Both a) and b)
E) All of the above
Based on structure, cells can be divided into two types. Which of the following represents those two types?
F) Prokaryote
G) Eukaryote
The major difference between a eukaryotic and a prokaryotic cell is:
presence of absence of a nucleus
The size of a typical bacterial cell is approximately:
2 um
Suppose you can focus on your slide under scan, but not under low power, high power or oil immersion. You know your microscope is clean and working properly. What is the most likely explanation?
The slide is upside down
Which of the following is a probable source of contamination for the microbiology student?
A) eating in the laboratory
B) placing personal objects on the laboratory table
C) chewing gum in the laboratory
D) all of the above
The most common shape and arrangement for bacteria seen in the mouth is usually:
diplococci
What is the function of the condenser on a light microscope?
concentrates the light onto the slide
A microscope that is parfocal:
allows the user to switch objectives without making major adjustments to focus