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Chapter 18 Genetics of Viruses and Bacteria. Chapter 18 Genetics of Viruses and Bacteria. Viruses: are much smaller than bacteria consist of a genome in a protective coat reproduce only within host cell use enzymes and ribosomes of host to make more viruses.

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Chapter 18 Genetics of Viruses and Bacteria


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    1. Chapter 18Genetics of Viruses and Bacteria

    2. Chapter 18Genetics of Viruses and Bacteria Viruses: • are much smaller than bacteria • consist of a genome in a protective coat • reproduce only within host cell • use enzymes and ribosomes of host to make more viruses

    3. Chapter 18Genetics of Viruses and Bacteria Lytic cycle: Lysogenic cycle:

    4. Chapter 18Genetics of Viruses and Bacteria Lytic cycle: Virus destroys host DNA, makes new viruses, digests cell wall Lysogenic cycle: Virus inserts DNA into host genome (becoming a dormant prophage). Generations later, virus reactivates.

    5. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    6. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    7. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    8. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    9. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    10. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    11. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    12. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    13. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    14. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    15. Chapter 18Genetics of Viruses and Bacteria Lytic cycle:

    16. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    17. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    18. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    19. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    20. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle: prophage

    21. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    22. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    23. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    24. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    25. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    26. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    27. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    28. Chapter 18Genetics of Viruses and Bacteria Lysogenic cycle:

    29. Chapter 18Genetics of Viruses and Bacteria Animal Viruses: • are diverse in their means of infection • often have an envelope acquired from cell membrane.

    30. Chapter 18Genetics of Viruses and Bacteria Retroviruses: • made of RNA • use reverse transcriptase to make DNA from RNA template • DNA inserts into host genome as dormant provirus.

    31. Chapter 18Genetics of Viruses and Bacteria Emerging viruses: • existing viruses that are expanding their host territory.

    32. Chapter 18Genetics of Viruses and Bacteria Viroids: • naked RNA Prions: • infectious proteins • mad cow disease.

    33. Bacteria Plasmids: • Small rings of DNA with accessory genes

    34. Bacteria Plasmids: • Small rings of DNA with accessory genes. chromosome plasmid

    35. Bacteria Transformation:

    36. Bacteria Transformation: • Bacteria take up naked DNA

    37. Bacteria Transformation: • Bacteria take up naked DNA

    38. Bacteria Transformation: • Bacteria take up naked DNA

    39. Bacteria Transduction:

    40. Bacteria Transduction: • Phages carry bacterial DNA

    41. Bacteria Transduction: • Phages carry bacterial DNA

    42. Bacteria Transduction: • Phages carry bacterial DNA

    43. Bacteria Transduction: • Phages carry bacterial DNA

    44. Bacteria Transduction: • Phages carry bacterial DNA

    45. Bacteria Conjugation:

    46. Bacteria Conjugation: • Bacteria “mate” to share DNA

    47. Bacteria Conjugation: • Bacteria “mate” to share DNA

    48. Bacteria Conjugation: • Bacteria “mate” to share DNA

    49. Bacteria Conjugation: • Bacteria “mate” to share DNA

    50. Bacteria Conjugation: • Bacteria “mate” to share DNA