Virology

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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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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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Plasmid

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

AP Bio Campbell 7E Chapter 18 Test Bank

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Ch 18 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following is (are) true about viruses? a. Viruses are classified below the cellular level of biological organization. b. A single virus particle contains both DNA and RNA. c. Even small virus particles are visible with light microscopes. d. Only A and B are true. e. A, B, and C are true. ____ 2. Which of the following is not a reason scientists suspected that something other than bacteria was the cause of tobacco mosaic disease? a. Passing infectious sap through a fine filter failed to remove the infectious agent. b. Treating infectious sap with alcohol failed to remove the infectious agent. c.

Virus, Bacteria, and Archaea Notes

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Archaea

18.1: Viruses and Bacteria Viruses What is a Virus? Virus: composed of nucleic acids enclosed in a protein coat and are smaller than the smallest bacterium Biologists consider viruses to be nonliving because viruses are not cells. Viruses do not carry out respiration, grow or develop. Viruses can only multiply when they are inside a living cell. Host cell: cell in which a virus replicates Almost all viruses are parasites because they destroy the cells in which they multiply. Viruses can infect the organisms of all six kingdoms. Because viruses are not alive, scientists do not use binomial nomenclature to name them.

AP Biology Chapter 19 Notes Campbell/Reece

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AP Biology ? Chapter 19 Viruses ? Overview: A Borrowed Life ? Viruses:???????? Basically just genes packaged in protein coats. ??????????????????????? They lack the structures and metabolic machinery found in cells ? ? Are viruses living or nonlinving? -??????????? They cannot reproduce or carry out metabolic activities outside of a host cell ? so they are kind of between living and non-living (hence ?A borrowed life?. ? ? A lot of what we know about molecular biology comes from the study of viruses ? a lot of the information about genes and nucleic acids. ? ??????????? The ability to manipulate genes and transfer them comes from the study of viruses ??????????? Viruses are used as the agents of gene transfer in gene therapy. ? ? ? ?

virus/bacteria worksheet

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cell

Introduction to viruses

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www.LessonPlansInc.com Topic: Introductory Bacteria and Virus Worksheet Summary: Students answer introductory questions about bacteria and viruses. Goals & Objectives: Students will be able to determine the difference between bacteria, viruses and animal/plant cells. Students will be able to remember important facts about viruses and bacteria. Standards: CA 1c. Students know how prokaryotic cells, eukaryotic cells (including those from plants and animals), and viruses differ in complexity and general structure. Time Length: 30 minutes Materials: ? Class textbook ? Photocopied worksheets ? Pencils or pens Procedures: 1. Tell the students which section they are to use in the textbook. Students are then going

Chapter 19 Viruses

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