PPT-CHARACTERISTICS OF VIRUSES

Are Viruses Living or Nonliving Biologists consider viruses to be nonliving because Are not cells Do not grow or respond to their surroundings Cannot make food take in food or produce wastes. 1. A program that attaches itself to another . executable. (a . host program. ). Whenever the host program is executed, virus code is ran and it can make a copy of itself and infect other executables found in your memory or hard drive. A. Viruses are a unique group of biological entities. 1. They are not capable of surviving without a host cell (lack metabolic machinery). 2. They do, however, contain all the information necessary to direct metabolic processes. copyright cmassengale. 2. Are Viruses Living or Non-living?. Viruses are both and neither. They have . some properties of life but not others. For example, viruses can be killed, even crystallized like table salt. Infectious Agents of Animals . and Plants. Chapter 14. What am I?. Structure and Classification of Animal Viruses. Classification of animal viruses. Taxonomic criteria based on. Genomic structure. DNA or RNA. Protists. , Fungi. Chapter 7. Grade 7 Science. Viruses. _____ - a tiny, non-living particle invades and then multiplies inside of a living cell.. Viruses can only multiply when they are _____ of a living cell.. CLS 212: Medical Microbiology. History. Through the 1800s, many scientists discovered that something smaller than bacteria could cause disease and they called it . virion. (. Latin word- poison. ).. Where the name came from. This is a phrase coined from biology to describe a piece of software that behaves very much like a real virus (only it spreads from computer to computer rather than people!).. Lecturer. Dr Ashraf Khasawneh. Department of Biomedical Sciences. Virus infections are Universal …….. Introduction to Virology. A virus is an obligate intracellular parasite containing genetic material surrounded by protein. What do viruses need to reproduce?. Other viruses. Host organisms. A nutrient medium. An enzyme solution. Which characteristic do viruses possess in common with living cells?. They contain a nucleus and organelles.. Viruses . A nonliving (?) particle made of proteins, nucleic acids, and sometimes lipids (fats). Viruses only reproduce by infecting living cells. Most viruses can only be seen with an electron microscope. EQ: Why are viruses considered to be non-
living?. Characteristics:. *Nonliving particles made of . nucleic acid. and a . protein coat . enlosed in a . capsid. shell... *In order to reproduce, all viruses must have a . VOCABULARY. Virus. Capsid. Envelope. Human . Immunodeficiency Virus (HIV. ). Influenza. Lytic Cycle. Lysogenic Cycle. Lysis. Retrovirus. Prerequisite questions. What are the eight characteristics which all living things have in common. 17. Classification of Life. 2. What am I???. What is my . name???. Why Classify?. 1.There are _______ known species of organisms. 2.This is only __________ organisms that ever lived!!!!!. 3.___________are still being found and identified. . . The process of transfer of virus into host is referred as . TRANSMISSION. and this is an important step in the life cycle of viruses.. Person to person infections are said to be . HORIZONTAL. .