viruses & bacteria
DESCRIPTION
Viruses & Bacteria. A guide to understanding the similarities and differences of viruses and bacteria. Two Monera Kingdoms. Archaebacteria Eubacteria. Archaebacteria. Ancient life form Live in extreme environments More than 300 million years old. Eubacteria. - PowerPoint PPT PresentationTRANSCRIPT
Viruses & Bacteria
A guide to understanding the similarities and differences of viruses
and bacteria
Two Monera Kingdoms
• Archaebacteria
• Eubacteria
Archaebacteria
• Ancient life form• Live in extreme
environments• More than 300 million
years old.
Eubacteria
• Most abundant form of life on Earth.
• Make foods, cause diseases and decompose matter.
• Live in warm, pH balanced, low-salt environments.
• Different cell membranes and RNA than Archaebacteria.
Viruses
• Greek word meaning “to poison”.
• Measured in nanometers (nm).
• A nanometer is = to 1 billionth of a meter.
• Viruses have 2 parts: a core of hereditary material and an outer coat of protection.
• A bacteriophage is a type of virus that infects a bacteria.
Bacteriophage
• It is a virus.• It attaches to bacteria
with it’s tail.• It sends it’s genetic
material from it’s head to it’s tail.
• More of the virus reproduces in the host bacteria.
Viruses come in many shapes and sizes!
• Viruses range in size from 10-250 nm.
• They do not have cells.
• They are non-living.
• They contain hereditary material (DNA or RNA).
• Most must have a host to survive.
• Strong protein coat.
Bacteria
• Kingdom: Moneran has been split into the Acheabacteria Kingdom and the Eubacteria Kingdom.
• One celled organisms.• No nucleus• Oldest form of life on Earth.• Most live in colonies.
Three types of bacteria
• Spirilla (spigh-RIHL-uh)
• Spirillum (singular)
• Cork-screw shaped.
Cocci
• Cocci (KAHK-sigh)
• Coccus (singular)
• Spherical shaped
Bacilli
• Bacilli (buh-SIHL-igh)
• Bacillus (singular)
• Rod shaped.
Movement of Bacteria
• Bacteria move with Flagella.
• These are tail like structures that help the bacteria to move in liquid.
Reproduction
• Bacteria reproduce by Binary Fission.
• They split in half!• When food is scarce
bacteria can form an Endospore.
• This is a protective resting cell.
They can double in number every 20 minutes!