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H spike definition microbiology10/30/2023 ![]() In the envelope, some or all of the regular membrane proteins are replaced with viral proteins Takes a bit of host cell membrane in the form of an envelope Three-dimensional, 20 sided figure with 12 evenly spaced cornersĪlthough they all display this symmetry, there are wide variations to protect DNA protects DNA from the enviroment What are the 2 different types of viral capsid?Ĭonstruction from identiacal subunits called capsomers The capsid and the nucleic acid togther are calledįully formed virus that is able to establish an infection in a host cell Virus -induced damage to the cell that alters its microscopic appearance Replicated and assembled in the cytoplasmĮnter host cell's nucleus where they are replicated and assembled Viruses that consist of only a nucleocapsid are considered naked virusesĮxplain the importance of viral surface proteins or spikesĭescribe the multiplication cycles in animal virsus? Virsus that possess an additional covering external to the capsid is called the envelope Two different types-Helical and Icosahedralĭistinguish between enveloped and naked viruses? Shell that surrounds the nucleic acid in the central core Virsus are the smallest infectious agents and usually can only be seen with the help of a electron microscrpeĭISCUSS the function and structure of viral capsids The other debate is even though viruses do not exhibit most life process they do effect them. ![]() If viruses are unable to multiple independently from the host cell, they are not living things. Viruses that persist in the (host) cell and cause recurrent disease are called latent The nucleic acid of animal viruses enter the cell through a process called penetration The nucleic acid of animal viruses enter the cell through a process called translocation The envelope of an animal virus is derived from the cell MEMBRANE of its host cell The envelope of an animal virus is derived from the cell wall of its host cell In lysogeny, viral DNA is inserted into host chromosomeĪ viral capsid is composed of subunits called virionsĪ viral capsid is composed of subunits called caposomers Rabies, cold sores, genital warts, mumps rubella In general, RNA virses multiply in the cell cytoplasm, and DNA virsus multiply in the cell nucleus.Ĭlear patches in cultures that indicate sites in virus infection are called? In general, RNA virses multiply in the cell_, and DNA virsus multiply in the cell_. The general steps in a viral multiplication cycle isĪ prophage is an early stage in the development of an Individual genes exist on seperate pieces of RNA It has all the double standed geno plus one single stranded genome Parvoviruses Refered to as infectious partilcles, either active or inactive Cannot exist independently from the host cell, so they aren't considered living things BUT since they can direct life processes they are considered more than a lifeless molecule. Who discovered an animal virus that caused foot and mouth disease in cattle? What did Ivanovski and Beijerinck showed? Could viruses be seen by the first microscopes?
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