Viruses

Jan 31, 2013

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Overview: A Borrowed Life. Viruses called bacteriophages can infect and set in motion a genetic takeover of bacteria, such as Escherichia coliViruses lead

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Viruses

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Viruses

Viruses. Viruses are microscopic (organisms?) which exhibit some characteristics of living things, but not all. Viruses range in size from .01 micrometers to .5 micrometers Viruses can’t reproduce on their own, but need a “host” cell. Viral Structure.

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Viruses

Viruses. Dead or alive?. Viral structure. Viruses are not cells. Basic structure: Protein coat Nucleic acid core (RNA or DNA) Lipoprotein coat (second coat – only in enveloped viruses). Virus Categories. DNA viruses – stable, do not mutate rapidly Single-stranded or double-stranded

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Viruses

Some phage multiply inside host cells, producingnumerous progenyThe infecting phage is referred to a lytic phageThe resulting infection is termed productiveMature phage exit via host cell lysisSome phage integrate their DNA into the hostgenomeThese phage are termed temperateThe resulting infection called latent A host bacteria carrying the phage is termed a lysogen and isin a lysogenic state.

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Viruses

Viruses. Doesn’t belong to any kingdom -It’s not a plant or an animal. -It’s not a fungi, protist, or bacteria. WHAT IS A VIRUS?. A virus is an infectious agent made up of nucleic acid ( DNA or RNA ) wrapped in a protein coat called a capsid .

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VIRUSES

Is a tiny particle that needs a host cell to reproduce and multiply. They are neither alive nor dead… but most scientists consider viruses nonliving particles, since these are NOT cells. VIRUSES.

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Viruses

Viruses. Chapter 18.1. What is a virus? A virus is nucleic acid wrapped in a protein coat Can be DNA or RNA Viruses are considering nonliving because they can’t reproduce on their own The cell that a virus uses to reproduce is called a host cell

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Viruses

Viruses. I can reproduce inside a living cell, yet I am dormant (inactive) outside a cell Q: Am I living or non-living? Q: Am I a eukaryotic or prokaryotic cell? What do you think?. What is a Virus?.

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Viruses

Viruses. Virus - means “poison ” Compared to bacteria, viruses are microscopic! Characteristics Core of DNA or RNA and a protein coat can only reproduce by infecting living cells. highly specific to host a. ex: plant viruses only infect plants. Structure.

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Viruses

Created By: Kyana Pereira & Sindy Morales February 23, 2011 Period 8. Viruses. What is a Virus?.

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Viruses

Viruses. By: Noor Abi Rached, Allison Lopez, Nazim Asani, and Drew Friedman. Introduction.

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Viruses

Viruses. Viruses. Virus: A nonliving strand of genetic material within a protein coat. Why are they considered not alive??? Cannot make proteins CANNOT REPLICATE ON THEIR OWN. Virus Structure. Capsid: All viruses have an outer layer made up of proteins.

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Viruses

Viruses. Human Immunodeficiency Virus Part II. Types of hiv. There are two types of HIV HIV-1 and HIV-2 Can be distinguished genetically and antigenically HIV-1 cause of current worldwide pandemic In the United States, unless otherwise noted, the term “HIV” primarily refers to HIV-1

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Viruses

Viruses . Biology 11 A. MacAskill . What is a virus?. Virus is the L atin word for Poison A Virus does not fit the six kingdom classification They lack the characteristics of living cells Unlike all true organisms (even the most simple bacteria) viruses have no cellular structure

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Viruses

Viruses. At the boundary of life, between the macromolecules (which are not alive) and the prokaryotic cells (which are), lie the viruses and bacteriophages (phages).

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Viruses

Viruses . What are Viruses?. Viruses are particles of nucleic acid, protein, and in some cases lipids. All viruses enter living cells According to science, viruses first developed from living cells. Discovery!. A plant disease in the 1800’s caused tobacco leaves to produce pale spots.

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Viruses

Viruses. Cause many infections of humans, animals, plants, and bacteria Cannot carry out any metabolic pathway Neither grow nor respond to the environment Cannot reproduce independently Obligate intracellular parasites. Viruses. Cause most diseases that plague industrialized world

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Viruses

Viruses. Computer Technology Day 21. Computer Virus. Set of program instructions that attaches itself to a file, reproduces itself, and/or spreads to other files. Computer Virus. Computer viruses can Corrupt files Destroy data Display irritating messages Corrupt computer systems.

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Viruses

Viruses. Genetics of Viruses. Viruses are parasites of cells A typical virus: Penetrates a cell Commandeers its metabolic machinery Assembles hundreds of new viruses that are copies of itself Then leaves the cell to infect other cells In the process, the host cell is destroyed.

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Viruses

Viruses . Introduction . Viruses Infect. Humans Other vertebrates Invertebrates Plants Fungi Bacteria ....they infect all cellular life forms. Can they be found anywhere else?. Found in: soil, air and water (high conc in aqueous environments). Nature. Pathogenic Non pathogenic.

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VIRUSES

VIRUSES. Computer Technology Part 5. Computer Virus. Set of program instructions that attaches itself to a file, reproduces itself, and/or spreads to other files It can Corrupt files Destroy data Display irritating messages Corrupt computer systems. Spreading Viruses.

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VIRUSES

VIRUSES. A very small living organism that enters a cell and makes copies of itself. An ultramicroscopic infectious agent that replicates itself only within cells of a living host. Step 1. The Virus attaches itself to a host cell. Virus. CELL. Nucleus. Step 2.

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VIRUSES

VIRUSES. CHAPTER 13. What are Viruses?. Obligate intracellular parasites Viral components Nucleic acids Capsid Envelope. Viral Shapes and Sizes. Helical Spherical Polyhedral. Infectious Properties. Viral Host range Spectrum of host Viral specificity Types of cells Viral Origins

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