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Bacteria. Salmonella spp. Escherichia coli. MRSA. Prokaryotes vs Eukaryotes. There are two basic types of cells: prokaryote and eukaryote. Plants, animals and fungi are eukaryotes: meaning they have a true nucleus.

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Presentation Transcript
bacteria

Bacteria

Salmonella spp.

prokaryotes vs eukaryotes
Prokaryotes vs Eukaryotes
  • There are two basic types of cells: prokaryote and eukaryote.
  • Plants, animals and fungi are eukaryotes: meaning they have a true nucleus.
  • Prokaryotes are single-celled organisms. All bacteria are prokaryotes.
  • They are the smallest, simplest organisms.
eubacteria
Eubacteria
  • This group includes the traditional bacteria and is the largest of the two.
bacteria are everywhere
Bacteria are everywhere!
  • They are found in nearly every habitat studied, including some that no other organism is able to withstand
general structure of a bacterium
General Structure of a Bacterium
  • Bacteria have :
  • a cell wall
  • a cell membrane
  • no membrane-bound organelles such as a nucleus, mitochondria, chloroplasts, Golgi apparatus, or ER.
movement cilia and flagella
Movement: Cilia and Flagella
  • Some bacteria are able to move using special cell structures called cilia and flagella.
  • Cilia are hair like
  • Flagella are tail-like
  • By repetitive beating (like a bending motion), they cause the cell to move. Think of oars in a boat.
bacterial shapes
Bacterial shapes
  • Cocci – spherical
    • Diplococci– pair
    • Streptococci - chain
  • Bacilli - rod-shaped
  • Spirochete – spiral
asexual reproduction fission
Asexual reproduction: Fission
  • Prokaryotes reproduce by simply splitting in two in a process called binary fission.
  • The DNA is copied and the cell divides into two identical cells.
sexual reproduction conjugation
Sexual reproduction: Conjugation
  • Sexual reproduction combines genes from two different individuals and increases variation.
  • Conjugation - Two cells join briefly and one cell donates some DNA (called a plasmid) to the other one.
video big bang
Video: Big Bang
  • http://www.youtube.com/watch?v=mx8itzrdV7I
  • http://www.ryancshaw.com/Files/micro/Animations/BacterialGrowth/PLAY_bacterial_growth.html
  • Cell phones and bacteria
    • http://www.teachertube.com/viewVideo.php?title=Cell_Phone_Bacteria&video_id=15882
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