what are some examples of helful biological viruses?
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Bacteriophages are visues that infect and kill bacteria. They are used to treat infection and diseases in humans.
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Some viruses ('phages') can be used to insert certain genes into the living cell. This isn't a standard procedure in any way, but it's becoming more and more studied...
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It can be either (a) or (b) or (d). This depends on how the strong the cell is or how conducive is that cell for that virus. (e) is not possible because virus and bacteria are two different organisms. Virus is much more smaller than bacteria.
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1.\n\n\n\n\n\n\n2. Viruses are neither unicellular nor multicellular organisms; they are somewhere between being living and non-living. Viruses have genes and show inheritance, but are reliant on host cells to produce new generations of viruses. Many viruses have similarities to complex molecules. Because viruses are dependent on host cells for their replication they are generally not classified as "living". Whether they are "alive", they are obligate parasites, and have no form which can reproduce independently of their host. Like most parasites, they have a specific host range, sometimes specific to one species (or even limited cell types of one species) and sometimes more general.\n\n3. protozoa and algae. I don't know why\n\n4. The protozoa are mostly single-celled, motile, and feed by phagocytosis, though there are numerous exceptions. They are usually only 0.01-0.5 mm in size, generally too small to be seen without a microscope. They are ubiquitous throughout aqueous environments and the soil, commonly surviving dry periods as cysts or spores, and include several important parasites. Based on locomotion, protozoa are grouped into:\n\nFlagellates with long flagella  -like Euglena\nAmoeboids with transient pseudopodia   -like Amoeba\nCiliates with multiple, short cilia    -Paramecium\nSporozoa non-motile parasites; form spores like Plasmodium.\n\n\n\n5. The algae gather light energy through photosynthesis. They include many single-celled creatures that are also considered protozoa, such as Euglena and Paramecium bursaria, which have acquired chloroplasts through secondary endosymbiosis. Others are non-motile, and some are truly multicellular, including some members of the following groups:\nChlorophytes green algae, related to higher plants  -like Ulva\nRhodophytes red algae  -like Porphyra\nHeterokontophytes brown algae, diatoms, etc.  -like Macrocystis\n\nThe green and red algae, along with a small group called the glaucophytes, appear to be close relatives of other plants, and so some authors treat them as Plantae despite their simple organization. Most other types of algae, however, developed separately. They include the haptophytes, cryptomonads, dinoflagellates, euglenids, and chlorarachniophytes, all of which have also been considered protozoans.\n\n\n6.\n\n\n\n\n\n\n7.\n\n\n\n\n\n\n8. hyphae is any of the threadlike filaments forming the mycelium of a fungus. Hyphae is a long, branching filament that, with other hyphae, forms the feeding thallus of a fungus called the mycelium. Hyphae are also found enveloping the gonidia in lichens, making up a large part of their structure. A typical hypha consists of a tubular wall, usually made of chitin, which surrounds, supports, and protects the cells that compose a hypha. For most fungi, a cell within a hyphal filament is separated from other cells by internal cross-walls called septa (singular septum).\n\nSome forms of parasitic fungi have a portion of their hyphae modified to form haustoria that are able to penetrate the tissues of a host organism. Similar, yet mutualistic forms of penetrating hyphae are called mycorrhizae and are important in assisting nutrient and water absorption by plants.\n\n\n\n9. \n\n\n\n\n\n\n\n\n10. Lichen is a fungus, usually of the class Ascomycetes, that grows symbiotically with algae, resulting in a composite organism that characteristically forms a crustlike or branching growth on rocks or tree trunks.
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It is Debatable, Whether they Are Alive or Not, I personally Think Not, Some Neat Images: http://www.virology.net/Big_Virology/BVHomePage.html
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there are no known viruses that do that
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Got some Dang horney virus...Hahahaha!!
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I don't know off the top of my head, but try looking here. It has loads of good and useful virology info.\nhttp://www-micro.msb.le.ac.uk/
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for protection from different virus
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Run a websearch for "anti virus" and you'll find quite a few.
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Viral\n  Menningitis\n  Mono\n  HIV\n  Influenza\n  Herpes\n\nBacterial\n  Common Cold\n  Tonsilitis\n   Laryngitis\n   TB\n   Staph
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They can be.  Some viruses are harder to kill then others.  I f viruses can't be killed, we would die of a simple cold.  Some viruses  are like roaches,  You could smash the ones you find, but they breed faster than you could kill them.  Others, like Herpes are attacked by our bodies defense until the virus is under control.  The remaining viruses hided where our defenses can't attack or find them.  When our defenses weekend, they come out again.  Others are like HIV.  Your body can kill them, but if the virus are able to make a foothold in our body, it attacks our immune system, therefor our body can't kill them anymore.
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Viruses themselves are not alive. Most virologists consider them non-living, as they do not meet all the criteria of the generally accepted definition of life. They are similar to obligate intracellular parasites as they lack the means for self-reproduction outside a host cell, but unlike parasites, viruses are generally not considered to be true living organisms. Among other factors, viruses do not possess a cell membrane or metabolise on their own.\n\ncompter viruses are not alive either.
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it depends on what kind of virus you are pertaining to. there two kinds of viruses that i know(what i have studied), the envelope viruses and the naked viruses. naked viruses are stronger than the envelope viruses. naked viruses has a capsid (skin of the virus) which is a protein while the envelope viruses has capsid + proteins. common naked viruses are gastroentiritis, genital warts, rashes, respiratory infections, hepatitis A, common colds, myelitis, rectal cancers, fetal death. common envelope viruses are yellow fever, dengue fever, german measles, chickenpox, SARS, measles virus, influenza viruses A B and C, T- Cell leukemia, parainfluenza and mumps.
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D.\n\nIt produces more viral particles up to the point where the cell cannot hold anymore and bursts. The amount of viral particles released is called the "viral burst size" and depends on the virus species. The released particles infect new cells and continue the cycle. This is why virus growth is an exponential curve.
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Bacteria are self-supporting life forms.  They live.  Viruses are non-living hijackers that have to hijack other cells to live.  They are just DNA bits or possibly RNA, and by themselves they don't do anything.  But they get into cells and re-program the cells to make more viruses, instead of doing whatever that cell was doing before.
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a host.\n\nA virus is a submicroscopic parasitic particle that infects cells in biological organisms. The study of viruses is virology.\n\nViruses are obligate intracellular parasites that lack the cellular machinery for self-reproduction. Viruses infect eukaryotes and prokaryotes such as bacteria; viruses infecting prokaryotes are also known as bacteriophages or phages. Typically viruses carry a small amount of genetic material, either in the form of DNA or RNA or both, surrounded by some form of protective coat consisting of proteins, lipids, glycoproteins or a combination. The viral genome codes for the proteins that constitute this protective coat, as well as for those proteins required for viral reproduction that are not provided by the host cell.\n\nViruses are non-living particles that can only reproduce when an organism reproduces the viral RNA or DNA. Viruses are considered non-living by the majority of virologists because they do not meet all the criteria of the generally accepted definition of life. Among other factors, viruses do not move or metabolize on their own. However, a comprehensive definition of life is still somewhat elusive since some bacteria (considered living) like rickettsia exhibit both characteristics of living and non-living particles.\n\n\nLife cycle\nAttachment, sometimes called adsorption: The virus attaches to receptors on the host cell wall. \nInjection: The nucleic acid of the virus moves through the plasma membrane and into the cytoplasm of the host cell. The capsid of a phage, a bacterial virus, remains on the outside. In contrast, many viruses that infect animal cells enter the host cell intact. \nTranscription: Within minutes of phage entry into a host cell, a portion is transcribed into mRNA, which is then translated into proteins specific for the infecting phage. \nReplication: The viral genome contains all the information necessary to produce new viruses. Once inside the host cell, the virus induces the host cell to synthesize the necessary components for its replication. \nAssembly: The newly synthesized viral components are assembled into new viruses. \nRelease: Assembled viruses are released from the cell and can now infect other cells, and the process begins again. \nWhen the virus has taken over the cell, it immediately causes the host to begin manufacturing the proteins necessary for virus reproduction. Some viruses, like herpes, cause the host to produce three kinds of proteins: early proteins, enzymes used in nucleic acid replication; late proteins, proteins used to construct the virus coat; and lytic proteins, enzymes used to break open the cell for viral exit. The final viral product is assembled spontaneously, that is, the parts are made separately by the host and are joined together by chance. This self-assembly is often aided by molecular chaperones, or proteins made by the host that help the capsid parts come together.\n\nThe new viruses then leave the cell either by exocytosis or by lysis. Envelope-bound animal viruses cause the host's endoplasmic reticulum to make certain proteins, called glycoproteins, which then collect in clumps along the cell membrane. The virus is then discharged from the cell at these exit sites, referred to as exocytosis. On the other hand, bacteriophages must break open, or lyse, the cell to exit. To do this, the phages have a gene that codes for an enzyme called lysozyme. This enzyme breaks down the cell wall, causing the cell to swell and burst. The new viruses are released into the environment, killing the host cell in the process