Prokaryote Competency Check

You are looking at bacterial cells through a compound light microscope. The objective you are using magnifies objects at 40X, and the ocular magnification is 10X. What is the total magnification of the bacteria cells?

400x

Which of the following statements regarding the diversity and abundance of bacteria is accurate?

1. There are more bacterial cells in a human body than human cells. 2. Bacteria can be found in all environments on Earth. 3. There are more bacteria species than all animal species combined.

True/False: You should begin viewing a specimen with the 10X objective lens.

False

Given that penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, which prokaryotes should be most vulnerable to inhibition by penicillin?

Gram positive bacteria

When cleaning the oil immersion lens, you should use only the following two items:

Lens cleaning solution and lens paper

Identify the bacillus bacteria.

Rod shaped

Not present in all bacteria, this structure enables those that possess it to germinate after exposure to harsh conditions, such as boiling:

endospore

When you use the higher magnifications on the microscope, focal adjustments should be made using the

fine focus knob

The cell walls of all bacteria contain ______________, though the arrangement and quantity of this molecule can vary by species.

peptidoglycan

Once staining and rinsing are complete, you will dry the slide by

pressing it between sheets of bibulous paper