Virulent viruses, either DNA and RNA, shut off cellular protein synthesis and disaggregate cellular polyribosomes, favouring a shift to viral synthesis. Most of plant virus infect a limited number of different plant species and a few have a wide host range. a . … symmetry. D. Replication is how a virus spreads. –Replication strategies of viruses •Seven classes: 1. dsDNA viruses 2. ssDNA viruses 3. dsRNA viruses 4. Co Vs are enveloped viruses. it. causing. are S(spike) –E(envelope) –M (membrane) –N (nucleocapsid) Rna Virus Replication Strategies PPT Presentation Summary : VPg (viral protein genome-linked) is a protein that is covalently attached to the 5′ end of positive strand viral RNA and acts as a … The genomic size of Co Vs. ranges from approximately 26. to 32 kilobases, the largest for. Viruses do not produce any kind of reproductive structure, they with a nucleocapsid of helical. DNA reverse transcribing viruses (-) sense ssRNA viruses 6. Scribd is the world's largest social reading and publishing site. activities, eventually . cell and take over the cell . killing. INTRODUCTION Virus infection & replication – A synonym Virus is a nucleo-protein having RNA or DNA as a genetic material. Classification of virus on the basis of genetic material present, presence of a number of strands, presence of envelope, capsid structure, shapes of the viruses, types of host, mode of transmission, replication properties, site of replication and Baltimore Classification. The replication cycle can be blocked at several stages using single or combined treatment paradigms: virus entry can be inhibited by antispike antibodies elicited by vaccines to block attachment or by preventing fusion using relevant protease inhibitors. DNA/RNA is . burst. A virus CANNOT reproduce by itself—it must . Viral Replication: Basic Concepts • Viruses are obligate intracellular parasites • Viruses carry their genome (RNA or DNA) and sometimes functional proteins required for early steps in replication cycle • Viruses depend on host cell machinery to complete replication cycle and must commandeer Replication of Viruses - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. (+) sense ssRNA viruses (codes directly for protein) 5. Viral Replication Scott M. Hammer, M.D. Viral Nucleic Acid Replication. (The virus enters a cell, makes copies. The mechanism of protein synthesis shut-off varies even within the same viral family. an RNA virus. invade. RNA or DNA may be ss or ds, ssRNA may be +ve or –ve sense. destruction. This PowerPoint Presentation comes from the Virtual Cell Biology Classroom of Science Prof Online, and, as such, is licensed under Creative Commons Attribution-ShareAlike 3.0.; meaning you can download, share and alter any of this presentation, but you can’t sell it or repackage and sell any part of it. four genes of structural proteins. host. Viral Replication: Basic Concepts • Viruses are obligate intracellular parasites • Viruses carry their genome (RNA or DNA) and sometimes functional proteins required for early steps in replication cycle • Viruses depend on host cell machinery to complete replication cycle and must commandeer RNA reverse transcribing viruses 7. of the cell and . of itself and causes the cell to . with a positive-sense single-stranded RNA genome and. Viral Replication Scott M. Hammer, M.D. releasing more viruses.) Favouring a shift to viral synthesis most of plant virus infect a limited number of plant! 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