Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 1 Chapter 6 - Virology • Topics –Structure –Classification –Multiplication –Cultivation and replication –Nonviral infectious agent –Teratogenic/Oncogenic - Viruses have a host range.That is, viruses infect specific cells or tissues of specific hosts, or specific bacteria, or specific plants. The smooth running of the organization was due to the Secretaries, Drs J. MATJRIN, J. BRANDES and V. VALENTA. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Viruses range from the structurally simple and small parvoviruses and picornaviruses to the large and complex poxviruses and herpesviruses. Ppt. Now customize the name of a clipboard to store your clips. The Baltimore system of virus classification devised by virologist & Nobel laureate David Baltimore is based on the genomic nature of the viruses. Classification of viruses Classification of viruses Yet, 30,000 - 40,000 viruses are known Viruses are classified in accordance to four main characteristics: Nature of nucleic acid in virion Symmetry of protein shell (capsid) Presence or absence of lipid membrane Dimension of virion and capsid Genomic has also become important. how virus survive, infect, spread, replicate and how they are related with one other. In addition to the protein coat, some viruses have specialized structures. Viral replication: lytic vs lysogenic. Subviral particles: viroids and prions. Meaning and History of Viruses: Viruses (Latin Venum – poisonous fluid) are simplest forms of life. Viruses: • Defination: • An infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host. Influenza commonly called “the flu”, is a contagious respiratory illness, a very important global public health problem. Virus wikipedia. See our User Agreement and Privacy Policy. View more Study on the go. Viruses are mainly classified by phenotypic characteristics, such as morphology, nucleic acid type, mode of replication, host organisms, and the type of disease they cause. Naming of influenza virus. All viruses have a capsid or head region that contains its genetic material. Viruses Definition. 19.1.5). Poliovirus, the causative agent of polio (also known as poliomyelitis), is a serotype of the species Enterovirus C, in the family of Picornaviridae.. Poliovirus is composed of an RNA genome and a protein capsid.The genome is a single-stranded positive-sense RNA (+ssRNA) genome that is about 7500 nucleotides long. Virus structure and classification. general structure and classification of viruses Powerpoint Presentation . The most common classification techniques are taxonomic and the Baltimore classification, which sorts viruses depending on their genome structure and the way in which they replicate. Change over time. In addition, viruses resembling wound tumour and lettuce … Virus are very small infectious agents with size ranging from 20-300nm in diameter. They are very small, ranging from 18 to 230 nm, making them the smallest infectious agent out there. Viruses are interesting because they are the robot hackers of microbiology, and in this video, we're gonna learn about what, exactly, makes them so good at being robot hackers. The smallest virus is only 17 nanometers, barely longer than an average sized protein. Viral Structure Viruses are minimally composed of a nucleic acid genome (DNA or RNA) and a protein coat. Viruses contain only one type of nucleic acid, either DNA or RNA, but information on which proteins form the capsid or the virus, as well as the nature of the viral genetic information and the sequence of the structural proteins. Viruses. Cellular division. Viral Morphology. NO. ; Inserted into the lipid membrane are ‘spikes’, about 10 nm long, which are glycoproteins, known as HA (hemagglutinin), and NA (neuraminidase). Check it out here! The three-dimensional structures of the particles of a number of viruses have been resolved by X-ray structural analyses. You can change your ad preferences anytime. These are extremely small organisms and visible only under an electron microscope. 01- General structure and classification of viruses1.ppt - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. If you continue browsing the site, you agree to the use of cookies on this website. Viral Structure Viruses are minimally composed of a nucleic acid genome (DNA or RNA) and a protein coat. The viruses are basically small size infection-causing agents.Which multiply in only living cells of Plants, Animals or Bacteria as well. These viruses are known as enveloped viruses. The virion structure consists of an outer envelope, the core, nucleoprotein and a nucleocapsid. Virus transmitted through respiratory route: Eg, Swine flu, Rhino virus; 2. You can change your ad preferences anytime. Google Classroom Facebook Twitter. Viruses are obligate intracellular organisms – this means they need to reside inside a host cell to survive. General Structure And Classification Of Viruses PPT Presentation Summary : Viruses are smaller than bacteria, they range in size between 20-300 nanometer (nm). No public clipboards found for this slide, Viruses, structure, classification and characteristics. That is, viruses infect specific cells or tissues of specific hosts, or specific bacteria, or specific plants. Human Rhinovirus Common Cold - Viruses have a host range. Nature of Viruses 3. These viruses consist of identical protein subunits or protomers which assembled in a helical structure around the genome. Next lesson. Powerpoint presentation. Date added: 10-22-2020 ADVERTISEMENTS: In this article we will discuss about Viruses:- 1. The capsid is made of proteins and glycoproteins. nucleus, no . Are viruses dead or alive? or cell membrane— Non-cellular. The Virus 2. A virus can take on a variety of different structures. kingdom 4. Looks like you’ve clipped this slide to already. zThe protein coat, or capsid, of an individual virion (fully assembled virus or virus particle) is composed of multiple copies of one or more types of proteins. 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