Prokaryotic Cells

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Characteristics of Living Organisms

UNICELLULAR

NO MEMBRANE BOUND ORGANELLES

EG. E COLI

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CELL WALL

Made of PEPTICLOGLYCAN (polymers of modified sugars linked by short chain polypeptides = net like multilayered structure)

protects cell

maintains shape

stops bursting

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PLASMA MEMBRANE

Made of phospholipids

partially permeable

controlls entry & exit

pumps substances in/out ACTIVE TRANSPORT

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PILI

made of protein

pulled in and out by ratchet mechanism

cell to cell adhesion

exchanging DNA ( conjugation)

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FLAGELLA

protudes from cell wall

propells cell

solid and inflexible

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CYTOPLASM

fills plasma membrane

water with dissolved substances

contains enzymes and ribosomes

chemical reactions of metabolism

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RIBOSOMES

smaller than eukaryotic ribosomes

involved in proteinsynthesis

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NUCLEOID

Cytoplasm with DNA

Total DNA is fewer than eukaryotic cells

Fewer ribosomes and proteins - LESS DENSE

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