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Bacteria Life Science Chapter 9, section 2 E. Coli and the Bacteriophage What it looks like in real life Bacteria Cell DNA Bacteria Cells that do not have a nucleus Exist almost everywhere on earth Grow in numbers so great you can see them with the unaided eye Eubacteria (True bacteria) Generally are surrounded by a cell wall Cyanobacteria Photosynthetic bacterium Bluish-greenish color Can do photosynthesis No chloroplasts Found nearly everywhere on earth. Can survive in extremely hot environments and even extremely cold environments Archaebacteria Can survive extremely harsh environments Do not require oxygen Can live in extremely salty environments Can live in extremely hot environments. Categories of Bacteria Cell Shape Movement How they get food Do they need oxygen How they reproduce Bacterium Shapes Sphere shaped bacteria Rod shaped bacteria Spiral shaped bacteria Movement • Flagella ~ Tail-like structure that whips around to propel the bacterium • Cilia ~ Lots of miniature flagella surround the cell and help to “swim” • Non-motile ~ Sticky cilia-like structures that keep the bacterium from moving Flagella Bacteria and their energy Autotrophs Chemotrophs Heterotrophs Autotrophs Make their own food Capture sun energy Cyanobacteria Chemotrophs Make own food Use Chemical energy Types of Archaebacteria Heterotrophs Have to consume food By eating Example: E. coli Oxygen requirements Some live without Oxygen Some can live with or without oxygen Some cannot live without oxygen. Bacteria Reproduction Binary Fission Conjugation Cellular organism copies its genetic information then splits into two identical daughter cells Conjugation Requires TWO organisms Results in swap of genetic information