Bacteria
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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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Bacteria

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Bacteria

Bacteria

Salmonella spp.


Bacteria

Escherichia coli

MRSA


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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