9 2a Viral Morphology Biology Libretexts Viral morphology. viruses are acellular, meaning they are biological entities that do not have a cellular structure. therefore, they lack most of the components of cells, such as organelles, ribosomes, and the plasma membrane. a virion consists of a nucleic acid core, an outer protein coating or capsid, and sometimes an outer envelope made of. This page titled 9.2: structure of viruses is shared under a cc by sa 4.0 license and was authored, remixed, and or curated by boundless via source content that was edited to the style and standards of the libretexts platform.
9 2a Viral Morphology Biology Libretexts Many viruses use some sort of glycoprotein to attach to their host cells via molecules on the cell called viral receptors (figure 1). among the most complex virions known, the t4 bacteriophage, which infects the escherichia coli bacterium, has a tail structure that the virus uses to attach to host cells and a head structure that houses its dna. Virus classification is based mainly on characteristics of the viral particles, including the capsid shape, the type of nucleic acid (dna or rna, double stranded (ds) or single stranded (ss)) within the capsid, the process of replication, their host organisms, or the type of disease they cause. the table below lists characteristics such as. Table 21.1. figure 21.6 viruses can be classified according to their core genetic material and capsid design. (a) rabies virus has a single stranded rna (ssrna) core and an enveloped helical capsid, whereas (b) variola virus, the causative agent of smallpox, has a double stranded dna (dsdna) core and a complex capsid. A dna virus is a virus that has dna as its genetic material and replicates using a dna dependent dna polymerase. the nucleic acid is usually double stranded dna but may also be single stranded dna. the dna of dna viruses is transcribed into mrna by the host cell. the viral mrna is then translated into viral proteins.
Classification Of Viruses Based On Host Morphology An Vrogue Co Table 21.1. figure 21.6 viruses can be classified according to their core genetic material and capsid design. (a) rabies virus has a single stranded rna (ssrna) core and an enveloped helical capsid, whereas (b) variola virus, the causative agent of smallpox, has a double stranded dna (dsdna) core and a complex capsid. A dna virus is a virus that has dna as its genetic material and replicates using a dna dependent dna polymerase. the nucleic acid is usually double stranded dna but may also be single stranded dna. the dna of dna viruses is transcribed into mrna by the host cell. the viral mrna is then translated into viral proteins. Morfología viral. los virus son acelulares, es decir, son entidades biológicas que no tienen una estructura celular. por lo tanto, carecen de la mayoría de los componentes de las células, como organelos, ribosomas y la membrana plasmática. un virión consiste en un núcleo de ácido nucleico, un recubrimiento proteico externo o cápside, y. Viral capsids can be (a) helical, (b) polyhedral, or (c) have a complex shape. image from biology 2e from openstax, licensed under creative commons attribution license v4.0 with the image credit (credit a “micrograph”: modification of work by usda ars; credit b “micrograph”: modification of work by u.s. department of energy).
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