Upload
althea
View
42
Download
3
Embed Size (px)
DESCRIPTION
Chapter 21 Viruses and Prokaryotes. Viruses. Where do viruses come from ?. Bacteriophage Replication. HIV Replication - Retrovirus. What Do These Pictures Have in Common?. gov.mb.ca. k8science.org. nuclearfamilywarhead.com. gsbs.utmb.edu. Brain Tissue. learn.genetics.utah.edu. - PowerPoint PPT Presentation
Citation preview
Chapter 21 Viruses and Prokaryotes
Viruses
Where do viruses come from ?
Bacteriophage Replication
HIV Replication - Retrovirus
HIV_replication.swf
What Do These Pictures Have in Common?
gov.mb.ca
k8science.org
gsbs.utmb.edunuclearfamilywarhead.com
Brain Tissue
learn.genetics.utah.edu
Protein Structure
new-science-press.com
Prions
stanford.edu
Dr. Stanley Prusiner.
cmu.edu
ViroidsConsist of short,
fragments of single-stranded RNA.
Only found in plants (so far).
Can interfere with plant’s metabolism, resulting in the plant being stunted or killed.
Ex. Potato spindle tuber
Left: normal potatoes; Right – infected potatoeswww.unece.org
Prokaryotic Cells
Yersinia pestis – Bubonic Plague. science.nationalgeographic.com Clostridium botulism.
www.nih.gov
Evolutionary History and Classification
Prokaryotic Nutritional Modes
Prokaryotic Body Plan
Prokaryotic Cell Size and ShapeProkaryotic cells are
much smaller than eukaryotic cells (about the size of mitochondria)
Prokaryotes have three typical shapes:
http://www.bio.miami.edu/~cmallery/150/proceuc/c8.27x3.bact.shapes.jpg, http://sharon-taxonomy2009-p2.wikispaces.com/Archaea
Prokaryotic FissionEsherichia coli undergoing prokaryotic fission
Conjugation
Bacterial Cell WallGram-positive
Bacteria Thick layer of
peptidoglycan (60-100%)
Gram-negative BacteriaThin layer of
peptidoglycan (10-20%)Has outer membrane
composed of mostly lipids (80-90%)
Gram-positive Bacteria
Gram-negative Bacteria
pathmicro.med.sc.edu
Gram Stain Results
Gram-positive bacteria stains violet to blue.
Gram-negative bacteria stains pink to red.
homepage.ntlworld.com
Cyanobacteria
Anabaena. http://www.biologie.uni-hamburg.de/b-online/fo42/anabaena.jpg
Oscillatoria. http://t2.gstatic.com/images?q=tbn:LsEmj27QxYGiHM:http://botit.botany.wisc.edu
Endospores
Methanogenic Archaeans
0.5 µm
Life in Extreme Environments
The End