Kingdom Eubacteria & Archaebacteria

**Bacteria (singular bacterium) - any of a group of microscopic single-celled organisms that live in enormous numbers in almost every environment on Earth, from deep-sea vents to deep below Earth’s surface to the digestive tracts of humans.

We have about 100,000 bacteria per square centimeter of skin.

**Bacteria are simple organisms that come in 3 different shapes:

**1. Cocci - sphere shaped

**2. Bacilli - rod-shaped

**3. Spirillum - spiral shaped.

They are prokaryotic because they do not contain a membrane bound nucleus or other membrane-bound organelles.

**Bacteria reproduce by FISSION = process that produces two new cells with genetic material identical to each other & that of the original cell.

**Conjugation - process where genetic material is exchanged between 2 bacteria

**Aerobe - uses oxygen when breaking down food

**Anaerobe - is adapted to live without oxygen

2 Kingdoms:

**Kingdom Eubacteria -

  • Grouped by
  • Cell shape & structure
  • How they obtain food
  • Type of food they consume
  • The wastes they produce

Example: Cyanobacteria = group of producers that make their own food using carbon dioxide, water & sun energy. Produce oxygen as a waste. Can pollute waterbodies with "blooms"

Consumer Eubacteria - gram-positive = thick walled, gram-negative= thin walled - affects antibiotic effectiveness

**Kingdom Archaebacteria - found in extreme conditions

  • Grouped by where they live or how they get energy
  • Salt, heat & acid lovers
  • Methane producers

How we use bacteria

**Antibiotics - chemicals that limit the growth of other bacteria

**Pathogen - any organism that causes disease

**Toxin - poisonous substance produced by a bacterial pathogen

**Endospore - thick-walled structure produced by a bacteria

**Vaccine - Substance made from damaged particles taken from bacterial cell walls or killed bacteria that can preven some bacterial diseases.

**Saprophytes - consumer bacteria that use dead organism as food and energy sources. Help recycle nutrients.

**Nitrogen-fixing bacteria - change nitrogen from the air into forms that plants and animals can use. Peanuts, peas, legumes

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a Copyright Violation, please follow Section 17 in the Terms of Use.