叫 Key Notes Methods of study Virus morphology has been determined by electron microscopy(EM)(using negative staining), thin-section EM (using negative staining), immunoelectron microscopy(using negative staining), electron cryo-microscopy and X-ray crystallography
Virus morphology has been determined by electron microscopy (EM) (using negative staining), thin-section EM (using negative staining), immunoelectron microscopy (using negative staining), electron cryo-microscopy and X-ray crystallography. Key Notes Methods of study
I Key Notes Virus symmetry Virus capsids have helical or icosahedral symmetry. In many cases the capsid is engulfed by a membrane structure(the virus envelope) Helical symmetry is seen as protein sub-units arranged around the virus nucleic acid in an ordered helical fashion, The icosahedron is a regular shaped cuboid which consists of repetitions of many protein sub-units assembled so as to resemble a sphere
Virus capsids have helical or icosahedral symmetry. In many cases the capsid is engulfed by a membrane structure (the virus envelope). Helical symmetry is seen as protein sub-units arranged around the virus nucleic acid in an ordered helical fashion. The icosahedron is a regular shaped cuboid which consists of repetitions of many protein sub-units assembled so as to resemble a sphere. Key Notes Virus symmetry
■■■L■ Key Notes Virus envelopes Virus envelopes are acquired by the capsid as it buds through nuclear or plasma membranes of the infected cell Envelopes may contain a few glycoproteins, for example, human immunodeficiency virus(HM), or many glycoproteins, for example. Herpes simplex virus (HSV). The virus envelope contains the receptors, which allow the particle to attach to and infect the host cell
Virus envelopes are acquired by the capsid as it buds through nuclear or plasma membranes of the infected cell. Envelopes may contain a few glycoproteins, for example, human immunodeficiency virus (HIV), or many glycoproteins, for example. Herpes simplex virus (HSV). The virus envelope contains the receptors, which allow the particle to attach to and infect the host cell. Key Notes Virus envelopes
Section 2 Virus Taxonomy The classification of viruses involves the use of a wide range of characteristics(morphology, genome, physicochemical and physica properties, proteins, antigenic and biological properties) to place viruses in orders, families, genera and species
The classification of viruses involves the use of a wide range of characteristics (morphology, genome, physicochemical and physical properties, proteins, antigenic and biological properties) to place viruses in orders, families, genera and species. Section 2 Virus Taxonomy
us orders re groupings of fam ilies of viruses that share co istics Virus families groupings of genera of viruses that share common characteristics and are distinct from the members of other families. They are designated by the suffix -viridae Virus genera These are groupings of species of viruses which share common characteristics. These are designated by the suffix -virus. Virus species These represent a polythetic class of viruses that constitutes a replicating lineage and occupies a particular ecological niche
These are groupings of families of viruses that share common characteristics. These are groupings of genera of viruses that share common characteristics and are distinct from the members of other families. They are designated by the suffix -viridae. These are groupings of species of viruses which share common characteristics. These are designated by the suffix -virus. These represent a polythetic class of viruses that constitutes a replicating lineage and occupies a particular ecological niche. Virus orders Virus families Virus genera Virus species