bacteria
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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BACTERIA
Salmonella spp.
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MRSA
Escherichia coli
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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.
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Eubacteria• This group includes the traditional bacteria and is the
largest of the two.
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Bacteria are everywhere!• They are found in nearly every habitat studied, including
some that no other organism is able to withstand
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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.
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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.
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Bacterial shapes• Cocci – spherical
• Diplococci – pair• Streptococci - chain
• Bacilli - rod-shaped• Spirochete – spiral
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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.
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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.
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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