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Bacteria Lecture! Might as well learn about em, because you dirty kids are covered in them! What you have to be able to do • • • • • 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!