gram negative tests

Why is it better to use at least 12 to 20+ chemical tests to identify an unknown bacterium?

What is the purpose of a Durham tube?  What type of test includes a Durham tube?

Durham test is used for gas detection and IMVIC

Why are biochemical tests only used on pure cultures?

To ensure an accurate identification

The IMViC tests are important for identifying what group of bacteria?

Enteric bacteria

What type of enzyme is most closely associated with Gram-negative bacteria?

Endoenzymes

Name a test medium that is used to perform more than one biochemical test?  Name the different biochemical traits assessed when using that medium?

SIM and motility

What tests are part of the IMViC group?

Indole, methyl red, Voges Prokauer and Citrate

Name four biochemical tests. Clearly indicate what is a positive result and what is a negative result.

Urease test positive (hot pink) negative (amber color)

Catalase test positive (bubbling) negative (no bubbling)

Indole test positive (red ring) negative (no red ring)

Citrate test positive (deep blue color with growth) negative (no growth and medium remains green)

What is meant by the trait called motility?

Directed movement by a bacteria

Which type of bacteria are least likely to show the trait of motility?

Cocci bacteria