1 / 16

Bacteria

Bacteria. Characteristics . Prokaryotic: no nucleus or membrane-bound organelles Cell contains “nucleoid” (DNA region), cytoplasm, a cell wall, and ribosomes Tiniest of living single cells. Four Groups: Eubacteria – “ true bacteria ” Cyanobacteria – blue-green bacteria

geneva
Télécharger la présentation

Bacteria

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bacteria

  2. Characteristics • Prokaryotic: no nucleus or membrane-bound organelles • Cell contains “nucleoid” (DNA region), cytoplasm, a cell wall, and ribosomes • Tiniest of living single cells

  3. Four Groups: • Eubacteria – “true bacteria” • Cyanobacteria – blue-green bacteria • Archaebacteria – recent findings • Prochlorobacteria – contain chlorophyll a & b (very similar to chloroplasts)

  4. Now... • Categorized into two kingdoms: I. Kingdom Archaebacteria II. Kingdom Eubacteria

  5. I. Kingdom Archaebacteria

  6. Archaebacteria • Oldest of all organisms on earth • Hypothesized to be the ancestors to all of life’s kingdoms • Can inhabit Earth’s most inhospitable regions • Can thrive in very hot, very acidic and very salty conditions – conditions that scientists think that existed on Earth billions of years ago.

  7. They get their own kingdom because... • The chemical properties of their cell wall and membrane are different from Eubacteria • Out of 1700 genes more than 50% are different than Eubacteria

  8. 3 main phyla of archaebacteria • Anaerobic methanogens – mainly live in the gut of animals, or at the bottom of marshes – how all of the methane gas is produced on earth.

  9. 3 main phyla of archaebacteria b) Halophiles– “salt-loving” bacteria living in extreme salty conditions, such as the Dead Sea Salt crystals

  10. 3 main phyla of archaebacteria c) Thermophiles– bacteria that can tolerate very hot temperatures, and acidic conditions – these bacteria inhabit naturally forming hot springs

  11. II. Kingdom Eubacteria

  12. ‘Eu’ = trueeubacteria = true bacteria

  13. Outer surface: • Cell wall - made up of complex carbohydrates, for protection • Cell membrane • Flagella - for transportation and locomotion

  14. Eubacteria Colony Shapes • Coccus: round • Bacillus: rod • Sprillum: spiral

  15. Reproduction • Binary Fission: eubacteria make a copy of their DNA, increase their cell size, and split to produce an identical copy

  16. Reproduction • Conjugation: eubacteria can pair up with another cell and exchange DNA

More Related