Presentation is loading. Please wait.

Presentation is loading. Please wait.

1. ARCHAEBACTERIA 2. EUBACTERIA  Live in harsh conditions  More normal and common bacteria.

Similar presentations


Presentation on theme: "1. ARCHAEBACTERIA 2. EUBACTERIA  Live in harsh conditions  More normal and common bacteria."— Presentation transcript:

1

2 1. ARCHAEBACTERIA 2. EUBACTERIA  Live in harsh conditions  More normal and common bacteria

3

4  Archaebacteria are prokaryotes.  Prokaryotes are: single celled without a nucleus organisms and are the smallest and simplest forms of life.  Archaebacteria are found in anaerobic and extreme conditions (high salt, high temperature, and/or very acidic.)  These are believed to be the conditions on the early Earth. Earth’s early atmosphere did not contain oxygen, therefore the earliest organisms were anaerobic.  Anaerobic  can live in the absence of oxygen

5  Lives in extremely salty places.  Picture on the right shows a salty pond in the Arabian desert that has turned red due to the presence of Halobacterium salinarum

6  Thermus thermophilus is an archaean which can withstand very high temperatures.  Often lives in hot springs like those found at Yellowstone.

7

8  Eubacteria are also prokaryotes.  Eubacteria is made up of more traditional bacteria and is a larger kingdom than archaebacteria.  They are found in almost all habitats.  Eubacteria are unicellular and have no membrane-bound organelles.  ie: no nucleus, mitochondria, chloroplasts, ER, or Golgi apparatus.

9 Archaebacteria and Eubacteria

10 1. Cocci  spherical 2. Bacilli  rod shaped 3. Spirilla  spiral shaped

11  Cilia and Flagella allow a bacterium to move.  Cilia are hair-like and work like oars in a boat.  Repetitive beating allows the cell to move.  If a bacteria cannot move cilia can also move water across the cell’s surface.  Flagella are whip-like and wave back and forth to move the cell.

12

13  Most bacteria are heterotrophs.  Heterotrophs feed on other organisms.  These include parasites which live and feed off of a living host  and decomposers that feed on dead and decaying organisms  Some bacteria are autotrophs.  Autotrophs use chemicals or photosynthesis as a form of energy.

14 Asexual ReproductionSexual Reproduction  Prokaryotes reproduce by splitting in two in a process called binary fission.  The DNA is copied and the cell divides into two identical cells.  Combines genes from two different individuals.  Prokaryotes that do not technically reproduce sexually can still mix genes with one another. Bacteria reproduce either asexually or sexually.

15  Cells that do not reproduce sexually can still mix genes through three processes: 1. Conjugation - Two cells briefly join and one cell donates DNA to the other. 2. Transformation – Bacteria pick up pieces of DNA from the environment. 3. Transduction - viruses can transfer pieces of DNA from one cell to another  These processes add genetic diversity to bacteria.  Mutation is also a large source of genetic diversity in bacteria.

16  Bacteria cause disease in two ways: 1. By damaging tissues and breaking down cells for food 2. By releasing toxins that interfere with the normal bodily functions of the host.

17  To treat diseases caused by bacteria we use: 1. Vaccines  small doses of live bacteria, killed bacteria, or parts of bacterial cells which cause an immune response.  Vaccines allow your body to learn how to kill a bacteria without getting sick. 2. Antibiotics  drugs that interfere with the growth of bacteria


Download ppt "1. ARCHAEBACTERIA 2. EUBACTERIA  Live in harsh conditions  More normal and common bacteria."

Similar presentations


Ads by Google