Virus evolution is a subfield of evolutionary biology that is specifically concerned with the evolution of viruses.
Viruses
Properties:
They are obligate intracellular parasites.
Probably there are no cells in nature that escape infection by one or more kinds of viruses. (Viruses that infect bacteria are called bacteriophages.) ...
Virus classification involves naming and placing viruses into a taxonomic system. Like the relatively consistent classification systems seen for cellular organisms, virus classification is the subject of ongoing debate and proposals.
Virus
(Science: virology) viruses are obligate intracellular parasites of living but noncellular nature, consisting of dna or rna and a protein coat. They range in diameter from 20-300nm.
virus
ultramicroscopic, virulent organism composed of a nucleoprotein core and a protein shell, which causes certain plant or animal diseases
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Viruses are the simplest living organisms. Even though they are the simplest, they were not the first forms of life, at least not the present day viruses. Viruses are obligate intracellular parasites and cannot replicate outside of a living cell.
Virus Structure
Viruses are not plants, animals, or bacteria, but they are the quintessential parasites of the living kingdoms.
Virus
A virus is an infectious agent that occupies a place near the boundary between the living and the nonliving. It is a particle much smaller than a bacterial cell, consisting of a small genome of either DNA or RNA surrounded by a protein coat.
Viruses and Bacteria
It's easy to mix these up since compared to us, both are VERY SMALL.
Viruses
Basic characteristics of viruses
Simply stated, viruses are merely genetic information surrounded by a protein coat. They may contain external structures and a membrane.
ARE VIRUSES EVEN ALIVE?
We're starting with the smallest of the small here. Some scientists argue that viruses are not even living things. We suppose it's easier to give you a list of what they can't do as opposed to what they can.
Virus
A small, infectious, obligate intracellular parasite. The virus genome is composed of either DNA or RNA.
Virus: A particle consisting of a nucleic acid core surrounded by a protein coat. New virus particles can only be produced by a cell which is infected by the virus.
AE Classic Collection Index
Resource Center Index ...
Viruses
Viruses are the vectors of choice for animal cells.
They can accept larger amounts of DNA than plasmids.
virus Infectious chemical agent composed of a nucleic acid (DNA or RNA) inside a protein coat.
vitamins A diverse group of organic molecules that are required for metabolic reactions and generally cannot be synthesized in the body.
virus
[L. slimy, liquid, poison]
A submicroscopic, noncellular particle composed of a nucleic acid core and a protein coat (capsid); parasitic; reproduces only within a host cell.
viscera ...
viruses: Extremely small and simple life-forms, made merely of a protein shell and a genome. A virus reproduces by inserting its genome into the cells of other life-forms. As those cells duplicate, so does the virus.
Top ...
Virus: A noncellular biological entity that can reproduce only within a host cell.
The Exploratorium, 3601 Lyon Street, San Francisco, CA 94123 ...
Virus An infectious agent composed of proteins and genetic material (either DNA or RNA) that requires a host cell, such as a plant, animal, or bacterium, in which to reproduce.
Virus: Any of various submicroscopic pathogens which can only replicate inside a living cell.
Taken from: ...
virus. A very small organism that can multiply only within living cells of other organisms and is capable of producing disease symptoms in some plants and animals.
Virus. An infectious particle composed of a protein capsule and a nucleic acid core, which is dependent on a host organism for replication.
virus - an ultra-microscopic (one dimension less than 200 μm) organism. Viruses cannot reproduce alone but must first infect a living cell and usurp its synthetic and reproductive facilities. Responsible for some diseases in plants and animals ...
virus
the smallest organism known, ranging in size from about 0.025-0.25 um. Viruses infect cells of bacteria, plants , and animals, and while they carry out no metabolism themselves, they are able to control the metabolism of the infected cell.
Retrovirus A class of viruses whose infectious genome is single stranded RNA and which, as part of their normal life cycle, integrate into their host genome after conversion of the RNA to DNA by the enzyme reverse transcriptase.
Retrovirus A virus that contains an RNA genome but that replicates through the intermediacy of double-stranded DNA that is integrated into the host-cell genome.
Reverse transcriptase An enzyme that synthesizes DNA by using an RNA template.
Viruses are obligate intracellular parasites that can be maintained only inside living cells. Whern we refer to something as "obligate" that indicates that the virus (in this case) must do or behave in the specified manner.
Viruses can also contribute to cancer by inserting their DNA into a chromosome in a host cell. Insertion of the virus DNA directly into a proto-oncogene may mutate the gene into an oncogene, resulting in a tumor cell.
Virus
A virus is little more than a strand of genetic material (DNA or RNA) surrounded by a protein known as capsid. Viruses do not carry out any metabolic processes and need to invade a living host (animal, plant, bacterium or fungus).
Virus
- An infectious agent composed of a single type of nucleic acid, DNA or RNA, enclosed in a coat of protein. Viruses can multiply only within living cells.
virus A submicroscopic noncellular particle composed of a nucleoprotein core and a protein shell; parasitic; will grow and reproduce in a host cell.
viscera Internal organs in the body cavity.
visceral arches See gill arches.
viruses - obligate intracellular parasites that require the host cell's biochemical machinery to drive protein synthesis and metabolize sugars.
Viruses are inert beings because they are simple particles of nucleic acids (RNA or DNA) wrapped by a capsule of protein that cannot experience life.
Retrovirus
Short for Reverse Transkriptase Onko Virus.
RNA virus that encode the enzyme reverse transcriptase so that their RNA can be transcribed into DNA in the host cell; ...
Plant Viruses and Viroids
Carnivorous Plants
Unusual Plants
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phage - viruses for microorganisms
photosynthesis - use of light to carry out reductive biochemical processes necessary for life. Pigments capture light energy in much the same way as an antenna captures a radio or tv signal.
Besides virus-mediated gene-delivery systems, there are several nonviral options for gene delivery. The simplest method is the direct introduction of therapeutic DNA into target cells.
Certain viruses have the ability to insert a copy of themselves into the genome of a host. The chemical that make this possible (reverse transcriptase) is widely used in genetic engineering.
A virus for which the natural host is a bacterial cell. Used as a vector for cloning segments of DNA.
Related Terms:
Virus
A noncellular biological entity that can reproduce only within a host cell.
An E. Coli virus. Commonly used bacteriophases in biology labs are T4, M13 and lambda phages.
Related
Vector ...
phage - virus that infects bacteria; altered phage can be used as cloning vectors. (short for bacteriophage - "bacteria eater") ...
BACTERIOPHAGE - A virus that infects bacteria; often simply called a phage. The phages which are most often used in molecular biology are the E. coli viruses lambda, M13 and T7.
Any foreign substance, such as a virus, bacterium, or protein, that elicits an immune response by stimulating the production of antibodies. (See Antigenic determinant, antigenic switching.) Antigenic determinant.
Bacteriophage -- a virus whose host is a bacterium; commonly called phage. Barr body -- the condensed single X-chromosome seen in the nuclei of somatic cells of female mammals.
^ ICTV Virus Taxonomy 2009
^ "80.001 Popsiviroidae - ICTVdB Index of Viruses." (Website.) U.S. National Institutes of Health website. Retrieved on 2009-10-28.
^ "90. Prions - ICTVdB Index of Viruses." (Website.) U.S.
BacteriophageBacterial virus. Lambda bacteriophage is the basis of many E. coli vectors which are used for cDNA and genomic DNA libraries.
Oncogene: A gene in a tumor virus or in cancerous cells which, when transferred into other cells, can cause transformation (note that only certain cells are susceptible to transformation by any one oncogene).
DNA molecule originating from a virus, a plasmid , or the cell of a higher organism into which another DNA fragment of appropriate size can be integrated without loss of the vectors capacity for self-replication; ...
If an entire molecule of DNA from the virus "bacteriophage lambda" were shown at this scale, the image would be 970 meters high. For the bacterium Escherichia coli, the image would be 80 kilometers long.
It may occur as the genome of certain viruses (such as reovirus) or may be produced during viral replication as a general marker for viral infection.
the formation of coats by monitoring the incorporation of fluorescently tagged clathrin or its adaptor AP-2 (adaptor protein 2), and have followed clathrin-mediated uptake of transferrin, single LDL (low-density lipoprotein) and single reovirus ...
A linear end-to-end arrangement of genes and other DNA, sometimes with associated protein and RNA. The form of the genetic material in viruses and cells.
Bacteriophage a type of virus that invades‚ lives in‚ and kills a host species of bacterium
(phago = to eat) ...
A fourth Draft BioCode was published in 1997 in an attempt to standardize naming in the three areas, but it does not appear to have yet been formally adopted. The International Code of Virus Classification and Nomenclature (ICVCN) remains outside ...
 See also: Cells, Organ, Trans, Human, Cell
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