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Virus

Virus, Bacteria, and Archaea Notes

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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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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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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

TEST BANK

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CHAPTER 19 PROKARYOTES AND VIRUSES Test Bank Test Bank Chapter 19 Prokaryotes and Viruses Multiple-Choice Questions 1. What historic figure died of a disease that had symptoms consistent with West Nile encephalitis? a. Alexander the Great b. Cleopatra c. Julius Caesar d. Queen Elizabeth I e. Socrates Section: 19:I&I Bloom?s: knowledge Ans: a 2. West Nile virus is transmitted to humans by a. birds b. cats c. other humans d. mosquitoes e. all of these Section: 19:I&I Bloom?s: knowledge Ans: d 3. Which of the following could be called "pathogens"? a. viruses b. bacteria c. viroids d. viruses and viroids e. viruses, bacteria, and viroids Section: 19: I&I Bloom?s: knowledge Ans: e 4. All prokaryotic cells have a. cell membranes b. nuclei c. ribosomes

Viruses, Prokaryotes, Protists, and Fungus Study Guide

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Viruses, Prokaryotes, Protists, and Fungus Study Guide Discovery of Viruses : ? While studying the tobacco mosaic disease that affects tobacco plants, scientist Dmitri Ivanovsky passed extracts of diseased tobacco leaves through filter pores small enough to strain out bacteria ( which was thought of as being pathogens) ? After realizing that the strained substance (thought to be disease free) could STILL pass on the disease, it lead him to believe that the pathogen was NOT bacteria?but what was it? Structure of Viruses : ? Basic viral structure includes genetic material (either DNA or RNA ? not both) surrounded by a protein called capsid. ? In some viruses, the capsid is surrounded by a lipid envelope that surface from which

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