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Lysogenic cycle

Pearson Ch. 19 - Viruses

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Biology
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Virology
Virus
Bacteriophage
Lytic cycle
RNA virus
Provirus
Lysogenic cycle
DNA virus
Prophage
Viral evolution
Viral envelope
Retrovirus

Ch 19: Viruses Overview: A Borrowed Life Viruses called bacteriophages can infect and set in motion a genetic takeover of bacteria, such as Escherichia coli Viruses lead ?a kind of borrowed life? between life-forms and chemicals The origins of molecular biology lie in early studies of viruses that infect bacteria Concept 19.1: A virus consists of a nucleic acid surrounded by a protein coat The Discovery of Viruses: Scientific Inquiry Tobacco mosaic disease stunts growth of tobacco plants and gives their leaves a mosaic coloration In the late 1800s, researchers hypothesized that a particle smaller than bacteria caused the disease In 1935, Wendell Stanley confirmed this hypothesis by crystallizing the infectious particle,now known as tobacco mosaic virus (TMV)

Chapter 17 Bio

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Biology
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Biology
microbiology
Bacteriophages
Virology
Molecular biology
RNA viruses
Virus
Lytic cycle
DNA virus
Lysogenic cycle
Animal virology
Viral envelope
health

Chapter: 17 Viruses Overview: A Borrowed Life ? A virus is an infectious particle consisting of little more than genes packaged into a protein coat ? Viruses lead ?a kind of borrowed life?, existing in a shady area between life-forms and chemicals. ? Viruses called bacteriophages can infect and set in motion a genetic takeover of bacteria, such as Escherichia coli. ? A virus consists of a nucleic acid surrounded by a protein coat. ? Virus lack the metabolic machinery found in a cell, thus they can?t reproduce or carry out metabolism. Concept 17.1 A virus consist of a nucleic acid surrounded by a protein coat ? Virus smaller than a ribosome and even the largest virus is barely visible under light Microscope ? Some viruses can be crystalized

Genetics of Viruses and Bacteria

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Biology
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microbiology
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Bacteriophages
Molecular biology
Bacteriology
Transduction
Lytic cycle
Lysogenic cycle
Virus
Prophage
Plasmid
health

Chapter 18: Genetics of Viruses and Bacteria Concept 18.2 is not required knowledge for the AP Exam and has been intentionally omitted. Overview: Microbial Model Systems viruses called bacteriophages can infect and set in motion a genetic takeover of bacteria E. coli and its viruses are called model systems because of their frequent use by researches in studies that reveal broad biological principles beyond their value as model systems, viruses and bacteria have unique genetic mechanisms that are interesting in their own right bacteria are prokaryotes with cells much smaller and more simply organized than those of eukaryotes viruses are smaller and simpler still Concept 18.1: A virus has a genome but can reproduce only within a host cell

Chapter 19 Viruses

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Biology
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Biology
Bacteriophages
microbiology
Virology
Molecular biology
Caudovirales
Lytic cycle
Virus
Lysogenic cycle
Provirus
Prophage
RNA virus
health

Viruses Chapter 19 Wow Are they alive???? Viruses are little more than genes packed into protein coats They lack the structures and metabolic activity found in most cells But they infect a host Cause a variety of diseases And can kill So it would be better to say they are in a nebulous state Not alive, not dead But instead living a borrowed life Structure Unlike bacteria Viruses cannot be cultured in media They need a host Not just nutrients The first isolated virus Was Tobacco Mosaic Virus Many viruses are smaller than a ribosome Millions can fit on a pin head Many viruses do not have the typical genome They can have double stranded DNA Single stranded DNA Single stranded RNA Double stranded RNA Can be called a DNA or RNA virus Depending on what it has
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