Bacteria
-
Upload
ursula-norman -
Category
Documents
-
view
21 -
download
0
description
Transcript of Bacteria
Diversity of Prokaryotes
• Bacteria are prokaryotes
• Prokaryotes make up two domains– Bacteria
(eubacteria) – Archaea
(archaebacteria).
Staphylococcus bacteriaon hair follicle
Archeabacteria• “ancient” bacteria • Unique cell walls
and ribosomes• most live in harsh
environments
Salty shallow tide pools
Deep sea vents Hot springs
Eubacteria
• "true" bacteria• largest kingdom • have cell wall, some
with flagella• many live in soil or
water• some cause
disease, decomposition
• some are photosynthetic
Salmonella invading human cells
Identifying Prokaryotes
Spiral shape = Spirocheteshttp://www.youtube.com/watch?v=i7BV4IOVKyg&feature=related
• http://www.youtube.com/watch?v=J6akNYlkehY&feature=related bacteria re-cap
• http://www.youtube.com/watch?v=tqOVYpkZ0qs bacteria song
• http://www.youtube.com/watch?v=JnlULOjUhSQ&feature=related white blood cell chase
Autotrophs– self-feeders
Photosynthetic– Light energy
Chemosynthetic– obtain energy
from hydrogen gas, hydrogen sulfide, or ammonia
Metabolism of Prokaryotes
Heterotrophs
• “Feed off of others”• Saprophytes
– Feeds off dead things (decomposers)
• Parasites– Feed off living things
(cause disease)
• Aerobes – require oxygen
• Anaerobes – Don’t need oxygen
Respiration
Tetanus
Flesh eating bacteria
Reproduction and Growth• Under optimum
conditions – divide ever 20 minutes
• Binary Fission– Asexual reproduction– Simple Cell Division
Importance of Bacteria
• Benefits to humans– Food Processing– dairy products
(cheese, cream cheese, yogurt, etc.)
– pickles, sauerkraut, vinegar