2 eubacteria n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
2. Eubacteria PowerPoint Presentation
Download Presentation
2. Eubacteria

Loading in 2 Seconds...

play fullscreen
1 / 14

2. Eubacteria - PowerPoint PPT Presentation


  • 113 Views
  • Uploaded on

2. Eubacteria. “true” bacteria microscopic ex cyanobacteria (blue-green algae) on earth for over 3 billion years able to carry out photosynthesis (produces oxygen) oxygen conc of atmosphere increased allowing oxygen breathers (animals) to survive. Uses of Eubacteria. digestion in intestines

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '2. Eubacteria' - chester-miranda


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
2 eubacteria
2. Eubacteria
  • “true” bacteria
  • microscopic
  • ex cyanobacteria (blue-green algae) on earth for over 3 billion years
  • able to carry out photosynthesis (produces oxygen)
  • oxygen conc of atmosphere increased allowing oxygen breathers (animals) to survive
uses of eubacteria
Uses of Eubacteria
  • digestion in intestines
  • yoghurt/cheese production
  • fermentation (wine, beer, pickling…)
  • wastewater/oil spill/toxic spill treatment
  • BiologySource
  • decomposers
dangerous eubacteria
Dangerous Eubacteria
  • cause health problems:
  • strep throat
  • food poisoning (E. coli and salmonella)
structure function of bacteria
Structure & Function of Bacteria
  • microscopic
  • smallest living cells
  • classified according to:
  • cell shape
  • cell wall structure
  • motility (way of moving)
1 cell shape
1. Cell Shape
  • 3 basic cell shapes
  • spherical – “cocci”
  • rod-shaped – “ bacilli”
  • spiral – “spirochetes”
can you name it

CAN YOU NAME IT???

diplococcus

staphylococcus

streptococcus

2 cell wall structure
2. Cell Wall Structure
  • 2 kinds of cell walls, appear different when stained with Gram stain
  • peptidoglycan – thick coat of sugars, makes wall strong & rigid (Gram postive)
  • less peptidoglycan (Gram negative)
movement
Movement
  • various methods:
  • most mobile bacteria use flagella (whip-like tail)
  • others secrete mucous can glide on
how bacteria reproduce
How Bacteria Reproduce
  • Asexual - Binary Fission
  • 1 original cell splits into 2
  • can occur in 20 minutes for many bacteria species.
  • In 12 hours, 1 bacterium can divide to form a colony of 68 billion cells.
  • overcrowding, waste, and food availability do not allow populations to grow this large.
  • produces colonies of bacteria that are genetically identical.
2 types of sexual reproduction
2. Types of Sexual Reproduction
  • Transformation: bacteria pick up stray DNA from their surroundings.
  • Conjugation: two bacterial cells join (= conjugate) to exchange genetic material (plasmids, separate from main DNA)
slide14

3. Transduction: viruses that infect bacteria transmit genetic material from another source

  • Endospores form when environmental conditions make normal functions too difficult.