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ACTIVITY 2:

EUBACTERIA

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COMMON FEATURES OF ALL

CELLS

Cell membrane

Cytosol

Genetic material

Ribosomes

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K. EUBACTERIA

General characteristics:

Prokaryotic- absence of true nucleusand absence of membrane boundstructures or organelles.

Metabolically diverse

Photoautotrophs

Chemoautotrophs

Photoheterotrophs

Chemoheterotrophs

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Unicellular formCellular arrangement (for complexity)

Filamentous

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Colonial

Motility

Non-motileMotile flagella, gliding movement,axial filaments, and gas vesicles

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Various modes of reproduction Sexual: Conjugation

Asexual: Binary fission

Fragmentation

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Significance: Photosynthetic (cyanobacteria)

Decomposers (common bacteria)

Nitrogen fixers (heterocystouscyanobacteria)

Pathogenic

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Also known as ARCHAEA Thrive in extreme conditions (high temperature,

high salinity, anaerobic conditions..)

Cell wall composition is not peptidoglycan but

pseudopeptidoglycan (due to the difference insugar component)

Methanogens- anaerobic, produce methane from H2and CO2

Halophiles- require high salt concentration

Thremoacidophiles- grow in hot (80-105C), acidicenvironment like hot springs, geysers, submarinevolcanoes; sulfate as source of energy.

K. ARCHAEBACTERIA

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