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Download Bacteria Notes - Laguna Middle School
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Bacteria Notes Page 266 Bacteria: • Prokaryotes, so singlecelled organisms without nucleus and other organelles like mitochondria Flagella: • A long, whip-like structure that helps the cell move Size and Shape: • Vary in size • Spherical (cocci) • Rod-like (bacilli) • Spiral (spirochete) Food • Some are autotrophs (make food from sun or chemicals) and some are heterotrophs (consume other food) • When your milk or meat spoils, it’s because a heterotroph has been eating it! Gram Staining • A chemical process to classify different bacteria • Gram + have thick peptidoglycan and 1 membrane • Gram – have thin peptidoglycan but 2 membranes E. Coli (-) and S. aureus (+)
