Virus infects vertebrates and plants. Morphology: Virions tightly enveloped (by a lipid membrane); slightly pleomorphic; spherical; 70 nm indiameter. Surface projections of envelope distinct; glycoprotein spikes (composed of twovirus proteins forming heterodimers). Nucleocapsids isometric; 40 nm in diameter. Symmetry icosahedral (T=4).
Jan 15, 2020 · 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.
SV40 is a naked icosahedral virus with a diameter of 45 nm. Its capsid contains 72 protein subunits. SV40 does not have enzymes in it unlike RNA viruses.
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1) Icosahedral- An icosahedron is a polyhedron with 12 vertices and 20 faces. Two types of capsomeres constitute the icosahedral capsid: pentagonal (pentons) at the vertices and hexagonal at the faces. There are always twelve pentons, but the number of hexons varies among virus groups.
VIRUS MODEL LAB: ICOSAHEDRAL VIRUS PURPOSE: To understand virus structure by building 3-Dimensional models of common viruses. MATERIALS: paper scissors thread for hanging Glue or tape metric ruler PROCEDURE: The paper model: Cut out the flattened virus model (of 2PLV, attached) and fold along all the links in the cutout.
A virus is a unit of infectious genetic material smaller than any bacteria and embodying properties placing it on the borderline between life and non-life. Viruses routinely infect the cells of both eukaryotes (such as animals, insects, and plants) and prokaryotes (such as bacteria).
ticular interest are the tailless icosahedral viruses that contain an internal membrane. These viruses infect crenarchea, euryarchaea, bacteria, or eukaryotes, and PRD1 serves for them as a model (2). At present, seven such archaeal viruses are known: thermophilic STIV (Sulfolobus turreted icosahedral virus) (3) and STIV2 (Sul-