PPT-Viral Genomes Virus A virus is a non-cellular particle made up of genetic material and

Viruses are very small smaller than the smallest cell They are usually surrounded by a capsid of proteins For replication viruses rely on their host cells ie the cells they infect Most viruses exhibit a limited host range they typically infect only specific types of cells of one host species. Size of genome. Segmented or not. Site of replication.  . FAMILIES of NEGATIVE STRAND VIRUSES.  . NON-SEGMENTED (-)STRAND VIRUSES. .  . RHABDOVIRIDAE. Rabies, VSV, & Plant viruses .  . FILOVIRIDAE. Viruses are not alive. A virus in an obligate intracellular parasite. Requires host cell to reproduce. Can be seen at magnifications provided by the electron microscope (they are microscopic). Characteristics of Viruses. DNA genetic material Historical perspectives. By. Dr. . Himanshu. . Bhushan. . Jaruhar. Assistants Professor, S. P. D. College, . Garhwa. Molecular biology. Unit 01 lecture o1. DNA genetic material Historical perspectives. Virus. What am I?. Virus. What am I?. Virus. What am I?. Virus. How do I spread?. Virus. How do I spread?. Virus. How do I spread?. Virus. How do I spread?. Virus. How do I spread?. Virus. What is my relationship between human behavior and me?. RNA virus. of the family . Orthomyxoviridae. that is responsible for the infectious disease . influenza. (or most commonly referred to as flu) in birds, various mammals (such as pigs) and humans. Typically, influenza is characterized by fever, sore throat, chills and other non-specific symptoms, it is a much more severe disease. It is spread around the world in seasonal epidemics and according to World Health Organization, these annual epidemics result in about three to five million cases of severe illness, and about 250 000 to 500 000 deaths.. . By. Prof. Dr. Abdul-Hameed Khalid . Khadhair. . Medical Virology:. - Introduction. - History and Technology Development. - Theories on origin of viruses. - Viruses and virus-like structures. History of Viruses:. . Outside . their host cells, viruses survive as . virus particles. , also known as . virions. . The . virion. is a . gene delivery . system; it contains the virus genome, and . its functions . are to protect the genome and to aid its . Introduction:. Viral infections of plants can cause necrosis, hypoplasia . or . hyperplasia and these effects can lead to symptoms such as. Growth retardation . Distortion. Mosaic patterning of leaves. Viral Replication. Viruses multiply only in living cells (As viruses are obligate intracellular pathogens they cannot replicate without the machinery and metabolism of a host . cell). . . The . host cell must provide the energy and synthetic machinery and the low-molecular-weight precursors for the synthesis of viral proteins and nucleic acids. . common cold. , which can be caused by one of the rhinoviruses, to AIDS, which is caused by HIV.. They can vary greatly in size, from approximately 5-10 kb (. Papovaviridae. , . Parvoviridae. , etc.) to greater than 100-200 kb (. 3rd. Lecture . Generalized Structure of Viruses. Viral components. Nucleic acids. Capsid. Envelope. Glycoprotein. Basic virus structure. Capsid protein. Nucleocapsid. Naked capsid virus. DNA. RNA. or. Albariño CG, Foltzer M, Towner JS, Rowe LA, Campbell S, Jaramillo CM, et al. Novel Paramyxovirus Associated with Severe Acute Febrile Disease, South Sudan and Uganda, 2012. Emerg Infect Dis. 2014;20(2):211-216. https://doi.org/10.3201/eid2002.131620. Dr.Luma. . amer. Viral genetics. Viruses are simple . creatures, . lacking an . energy-generating system . and having very limited . biosynthetic capabilities. . The smallest viruses have only a . few genes. Host has elaborate systems to shut down viral functions. . The outcome of infection may vary from essentially benign and undetectable, to tolerated, to lethal.. Physiologic, immune, or inflammatory responses of the host.