MICROBIOLOGY 101 LABORATORY MANUAL

EXERCISE #5: GRAM STAIN SELF-TEST EXAM

DATE: 2/3/97

UPDATED: 12/30/97

A. This is a bacterial gram stain. Answer the following questions:

  1. What is the gram reaction of this organism?
  2. Describe the form or shape of this bacterium in one word.
  3. What is the specific name of the stain that is coloring this bacteria?
  4. In what order was this stain added to the bacterial smear?

B. This is a bacterial gram stain. Answer the following questions:

  1. What is the gram reaction of this organism?
  2. Describe the form or shape of this bacterium in one word.
  3. What is the specific name of the stain that is coloring this bacteria?
  4. What is the name of this stain that designates its function in this procedure?
  5. In what order was this stain added to the bacterial smear?

C. This is a bacterial gram stain. Answer the following questions:

  1. What is the gram reaction of this organism?
  2. Describe the form or shape of this bacterium in one word.
  3. Describe the general special type of bacteria this represents.
  4. What is the specific name of the stain that is coloring this bacteria?
  5. What is wrong with this result?

D. This is a bacterial gram stain. Answer the following questions:

  1. What is the gram reaction of this organism?
  2. Describe the form or shape of this group of bacteria.
  3. Give a likely scientific name for this bacterium and tell where is resides on our bodies.

E. This is a bacterial gram stain. Answer the following questions:

  1. Is this a good or bad gram stain in your opinion. Explain in a couple of sentences.
  2. Describe the steps taken to obtain this result.

F. This is a bacterial gram stain. Answer the following questions:

  1. Two different bacteria are present. Describe their morphology.

  2. What is their Gram characteristic?