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Bacteria Our invisible friends

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BacteriaOur invisible friends

Bacteria are prokaryotes

Pro – beforeKaryon – nucleusThe simplest forms of life are

prokaryotes without a nucleus.Earth’s first cells were

prokaryotes.

Lots of Them!

Prokaryotes are Earth’s most abundant life forms.

They can survive in many environments.

They can get energy from many different sources.

Page 4: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

Prokaryote Review

Mostly single-celledNo nucleus or organellesCircular chromosomesCell wallsReproduce mostly asexuallyAnaerobic or aerobicHeterotrophic or autotrophic

Page 5: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

ArchaebacteriaCan survive without oxygen

Page 6: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

EubacteriaParasitic heterotrophs (Streptococcus)Saprophages

Sapro = death Phage = eat

Include the most ancient prokaryotes

Page 7: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

Bacteria are Named by Shape

Cocci (ball-shaped) Streptococcus mutans

Bacillus (rod-shaped) Clostridium botulinum

Spirilli (spiral-shaped) Treponema palladium

Page 8: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

Page 9: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

Germ Theory of Disease

Joseph Lister – Aseptic Techniques

Robert Koch – Germ Theory A specific microorganism causes

a specific disease

Page 10: Bacteria Our invisible friends. Bacteria are prokaryotes Pro – before Karyon – nucleus The simplest forms of life are prokaryotes without a nucleus

The Prokaryotes: Bacteria February 4, 2015. The Prokaryotes

19–1 Bacteria The smallest and most common microorganisms are prokaryotes—unicellular organisms that lack a nucleus

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AQUATIC PROKARYOTES. Prokaryotes: without a nucleus, very small, relatively simple – Kingdom Archaebacteria – Kingdom Eubacteria Eukaryotes: with a nucleus,

KINGDOMS. Bacteria Prokaryotes (no true nucleus) Unicellular Autotrophic (makes own food) Heterotrophic (consumes others) Chemoautotroph (break down inorganic

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Prokaryotes Review: No true nucleus (no nuclear membrane) No cellular organelles Single celled The bacteria

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Bacteria (prokaryotes – no nucleus) Archaea (prokaryotes, but with similarities to next group) Eukarya (eukaryotes – have DNA in a nucleus) › Protista

Chapter 2 Mitosis & Meiosis. Cell Types Prokaryotes (bacteria) –Single cell –No organelles, no nucleus (nucleoid – circular DNA) Eukaryotes –Multicellular

THE GENETICS OF BACTERIA. Bacteria Are Prokaryotes

Bacteria: Part II. Classification of Bacteria: Bacteria are microscopic prokaryotes. Prokaryotic cells lack a “true nucleus” that separates their genes

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BACTERIA Prokaryotes are single-celled organisms that do not have a membrane-bound nucleus. Prokaryotes are single-celled organisms that do not have a