Lecture_twentyTwo - Mean=68.8 A 80 60 Frequency 40 20 0 40 50 60 70 80 90 100 Percent 37.5 42.5 47.5 52.5 57.5 62.5 67.5 72.5 77.5 82.5 87.5 92.5

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40 50 60 70 80 90 100 0 20 40 60 80 Frequency Percent A Mean=68.8%
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37.5 2 2 0.3937 42.5 13 15 2.95276 47.5 15 30 5.90551 52.5 29 59 11.61417 57.5 51 110 21.65354 62.5 68 178 35.03937 67.5 80 258 50.7874 72.5 90 348 68.50394 77.5 81 429 84.44882 82.5 44 473 93.11024 87.5 24 497 97.83465 92.5 11 508 100 97.5 0 508 100
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The Genetics of Viruses and Prokaryotes Chapter 13
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I. Introduction to Viruses The first virus was discovered in the 1890s—it was an agent that causes tobacco mosaic disease. The “agent” could pass through a filter that retained bacteria, and could diffuse through an agar gel so it discovery was delayed . The agent was crystallized in 1930s.
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Bacteriophage Bacteria The size (scale) of viruses 6ft 7in
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Because of their size Viruses ( and Prokaryotes ) make good model organisms: Small genomes Reproduce quickly Usually haploid What is the genetic material of prokaryotes. .viruses ? DNA, viruses DNA/RNA What does haploid mean? One set of chromosomes
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Viruses are acellular . 1. Most are composed only of nucleic acids (DNA/RNA) and some proteins. That is they consist of a central core of DNA or RNA, surrounded by a capsid of proteins (capsomeres). 2. Viruses do not : Regulate transport of materials into and out of themselves Perform any metabolic functions More on viruses.
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Viruses are obligate intracellular parasites . They use the host cell’s DNA replication and protein synthesis machinery to reproduce themselves. Because they cannot perform the latter functions: Viruses outside the host cell are called virions . Viruses are not affected by antibiotics that
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This note was uploaded on 03/29/2008 for the course CEM 251 taught by Professor Rathke during the Spring '07 term at Michigan State University.

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Lecture_twentyTwo - Mean=68.8 A 80 60 Frequency 40 20 0 40 50 60 70 80 90 100 Percent 37.5 42.5 47.5 52.5 57.5 62.5 67.5 72.5 77.5 82.5 87.5 92.5

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