Transcript Bacteria Lecture! - Mayfield City Schools

Bacteria Lecture!
Might as well learn about em, because you dirty
kids are covered in them!
What you have to be able to do
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Describe the size of bacteria
Describe where we find bacteria
Describe a couple different types of bacteria
Compare a virus to a bacteria
Compare bacteria to eukaryota
Quick note
• Most bacteria are not harmful to humans!
Bacteria = prokaryotes
• Prokaryote  Before nucleus!
• Tiny! 1000x smaller than one of your cells
• Abundant in air water soil, your notebook,
Logan’s phone, Sam’s locker
http://www.youtube.com/watch?feature=ends
creen&NR=1&v=JAqW4OTFB4M
Organization of a bacteria*
• Most have cell wall surrounding membrane
• Glycocalyx surrounds cell wall (it’s a
polysaccharide
• Capsule vs slime layer
• Fimbrae
Binary Fission
• Technically different than mitosis
• Same result!
Conjugation
• Bacteria link via a sex/
conjugation pilus
• DNA passes through pilus
Transformation
• Prokaryotes pick up DNA in the environment
Bacteria types
• Gram positive – have peptidoglycan layer
penicillin works
against PG layer
• Gram negative - no peptidoglycan layer
Bacteria Types
• Spirilum
• Bacilli
• Coccus
Biochem
• Some live only without oxygen obligate
anaerobes
– Tetanus botulism,
• Facultative anaerobes
Autotrophic or heterotrophic
• Some make their food
• Some do not
Some videos!