Purple nonsulfur bacteria

Definition

Purple nonsulfur bacteria are a group of phototrophic bacteria capable of photosynthesis without producing oxygen. They can grow in the presence or absence of light and use organic compounds as electron donors.

5 Must Know Facts For Your Next Test

1. They are classified under the family Rhodospirillaceae.
2. They perform anoxygenic photosynthesis, meaning they do not produce oxygen.
3. These bacteria can switch between photoheterotrophic and chemoheterotrophic growth modes.
4. They contain bacteriochlorophylls and carotenoids, which give them their distinctive color.
5. They are typically found in aquatic environments like ponds, lakes, and hot springs.

Review Questions

• What type of photosynthesis do purple nonsulfur bacteria perform?
• In what types of environments are purple nonsulfur bacteria commonly found?
• What pigments are responsible for the coloration in purple nonsulfur bacteria?

Related terms

Anoxygenic Photosynthesis: A form of photosynthesis used by certain bacteria that does not produce oxygen as a byproduct.

Bacteriochlorophyll: A type of chlorophyll used by various phototrophic bacteria for capturing light energy.

Photoheterotrophs:

Organisms that obtain energy from light but require organic compounds as carbon sources.