MICR 2420 Lecture 8: MICR 2420 Lecture 8
27 Jun 2018
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Chapter 6
Viruses
© 2017 W. W. Norton & Company, Inc.
Joan L. Slonczewski and John W. Foster
Microbiology:
An Evolving Science
FOURTH EDITION
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6.4 Bacteriophages:
Learning Objectives
• 6.4.a. Distinguish the lytic, lysogenic, and slow-release viral cycles.
• 6.4.b. Explain how bacteria defend themselves against viruses.
• 6.4.c. Bacteriophages in the human intestinal tract
6.5 Animal and Plant Viruses
Learning Objectives
• 6.5.a. Animal virus replication cycles.
• 6.5.c. Recall how plant viruses enter a host cell and transmit to uninfected cells.
• 6.5.d. Describe viral defenses.
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Viral infection and reproduction:
Biosynthesis is complicated by the presence of an envelope and, in
animal viruses, the nature of the genome (e.g RNA viruses,
retroviruses)
3
7. (Maturation)
6. Release
5. Assembly
4. Biosynthesis
3. Uncoating
2. Penetration
1. Attachment
**
of virion
A"PUB"ARM
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Document Summary
2017 w. w. norton & company, inc. Distinguish the lytic, lysogenic, and slow-release viral cycles: 6. 4. b. Explain how bacteria defend themselves against viruses: 6. 4. c. Recall how plant viruses enter a host cell and transmit to uninfected cells: 6. 5. d. Viral infection and reproduction: attachment of virion, penetration, uncoating, biosynthesis, assembly, release, (maturation) Biosynthesis is complicated by the presence of an envelope and, in animal viruses, the genome (e. g rna viruses, retroviruses) the nature of. Virion attaches to cell receptors via viral receptors (tropism) Bacteriophages can undergo two different types of life cycles: lytic cycle. Rapid phage replication & lyses / kills host lytic phages, e. g. phages t2, t4: lysogenic cycle. Phage lysogenize the host leading to a state called lysogeny inserts its dna into host chromosome. Activated to excise and follow lytic life cycle by certain triggers. During the exit from lysogeny, virus can acquire the hots genome and pass them to hots cell .
