Bacteria Structure and Function 1 Characteristics of Bacteria

Bacteria Structure and Function 1

Characteristics of Bacteria 2

Bacterial Structure 18. Microscopes are used to view prokaryotes 19. No nucleus or membrane-bound organelles 20. Contain ribosomes(yes) 21. Single, circular chromosome in nucleoid region 3

Bacterial Cell 22. 23. 4

Protection • Cell Wall made of 24. Peptidoglycan • May have a sticky 25. coating called the Capsule for attachment to host or other bacteria 5

Sticky Bacterial Capsule 6

Bacterial Structure PLASMIDS • Have small rings of DNA called Plasmids(26. ) • Unicellular • Small in size 27. (0. 5 to 2μm) 7

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Bacterial Structure • Most grow best at 31. p. H of 6. 5 to 7. 0 • 32. Many act as decomposers recycling nutrients • 33. Some cause disease 9

33. Staphylococcus Bacterial 10

Useful Bacteria 34. Other uses for bacteria include making yogurt, cheese, and buttermilk. 11

Pili 42. Short protein appendages 43. Smaller than flagella 12

Bacterial Shapes 13

Shapes Are Used to Classify 45 a. Bacillus: Rod shaped b. Coccus: Spherical (round) c. Vibrio: Comma shaped with flagella d. Spirillum: Spiral shape e. Spirochete: wormlike spiral shape 14