Microbiology Demystified

Nocardia Forms

Nocardia are a group of a long thread-like cylinder shaped bacteria that inhabits
soil and need oxygen to grow (aerobic). They are gram-positive and cannot
move by themselves (they are non-motile).
Nocardia asteroids, also known as N. asteroids, is a common bacterium
within this group. It causes mycetoma, which causes abscesses on the hands and
feet and also causes lung infection.

Quiz

1. Archaea can exist in very hot and very cold environments, making them
   a resilient microorganism that can survive attacks and destroy other
   bacteria.
   (a) True
   (b) False


2. Archaea that function in the presence of air are called
   (a) methanogenic archaea
   (b) cell wall–less archaea
   (c) sulfate reducers
   (d) extreme halophiles


3. Archaea that live in an extreme salty environment are called
   (a) methanogenic archaea
   (b) cell wall–less archaea
   (c) sulfate reducers
   (d) extreme halophiles


4. Single-celled archaea that produce methane and carbon dioxide (CO 2 ) by
   fermenting simple organic carbon compounds or oxidizing H 2 without
   oxygen to produce CO 2 are called
   (a) methanogenic archaea
   (b) cell wall–less archaea
   (c) sulfate reducers
   (d) extreme halophiles

CHAPTER 10 The Prokaryotes^165