140 likes | 353 Vues
Bacteria. - “pro” = before - “ karyon ” = nucleus NO nucleus NO organelles Small , less complex Circular DNA, floats in cytoplasm i.e. Bacteria. - “ eu ” = true - karyon ” = nucleus Have nucleus Organelles Large , complex Linear DNA, in nucleus i.e. Plants & Animals.
E N D
- “pro” = before - “karyon” = nucleus NO nucleus NOorganelles Small, less complex Circular DNA, floats in cytoplasm i.e. Bacteria - “eu” = true - karyon” = nucleus Have nucleus Organelles Large, complex Linear DNA, in nucleus i.e. Plants & Animals Prokaryotes vs. Eukaryotes
First Photosynthetic Prokaryote Oxygen is produced in oceans and creates ozone Cyanobacteria
3 Shapes • 1. Coccus (round) • 2. Bacillus (rod) • 3. Spirillum (sprial) Staphylococcus aureus Escherichia coli Streptococcus pyogenes
Gram-staining • Method used to classify bacteria into 2 groups: Gram-positive vs. Gram-negative • stains peptidoglycanin cell walls of the bacteria
Endospores • Specialized “resting” cells • dormant cell formed by certain bacteria that can survive very harsh conditions (heat, cold, poison)
Example – Closdridiumbotulinum • Caused from improper canning • Produces neurotoxins that lead to paralysis
Movement • Flagella – long whip-like tails • pili – short projections which allow them to stick to their hosts, their environment or each other.
Methods of ObtainingEnergy • Photosynthesizers • Chemoautotrophs • Heterotrophs
Bacteria Lab • Which locations at NMHS have the most bacteria? Cell Phone Bacteria