what is the difference between virus and bacteria?
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Bacteria are capable of living alone. Viruses are said to be alive only when inside a living cell.\n\nBacteria have cell organelles and show life activities. Virus are just a core of DNA or RNA surrounded by a sheath of protein and can only show reproduction while in a living cell.\n\nBacteria are intercellular organisms( they live in-between cells ). Viruses are intracellular organisms ( they live within/inside cells )\n\nThere are many useful bacteria, that help in processes like nitrification and lactification. Viruses on the other hand are always disease causing. In fact, the term 'Virulesence', which is used for a disease causing organism, is derived from the word Virus'
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Viruses are infectious agents that require cells for their reproduction.  The replicate by controlling a living cell’s material independently of the cell’s DNA.  This cell is called a Host.  The viral genetic material can be double stranded DNA, single stranded DNA or RNA.  A virus out side of a living cell is called a virion and is metabolically inert.  (It is also covered by a protein or other coating).  They do mutate readily.\nOnce inside a living cell, the virus sheds it’s coating and deactivates much of the genetic material of the cell, only allowing that which it needs or which do not interfere with their replication.  They then force the cell to replicate their genetic material as new virions which will be released when the cell ruptures.\nOpite gave good info on the size of the virus in terms of linear measurements.  Size, in terns of the number of bases runs from as few as 5,000 bases (single strand DNA) for the H-1 parvovirus to about a half a million base pairs in the largest.\nViruses are not considered to be alive.
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They're different types of viruses.  \n\nViruses are a large family of infectious agents.  They all look different, and they do different things to your body.  Rabies, the flu and herpes are also viruses - and each one makes you sick in it's own unique way.\n\nMaybe it's easier to think of it like this; in this world, there are sharks, flounders and clown fish.  They're all from the same family (fish) - but they are all look and behave differently from one another aren't they?  Same thing goes for viruses, bacteria & almost every other thing on the planet!  Things simply evolve in special ways to serve a purpose.
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Because bacteria and viruses cause many diseases and people often confuse them. The way they reproduce is the primary functional difference.\n\nThey differ greatly in size. Viruses are normally much smaller. \n\nBacteria are complex compared to viruses. A typical bacterium has a rigid cell wall and a thin membrane surrounding cytoplasm inside the cell. A bacterium contains all of the genetic information needed to make copies of itself. Bacteria also have tools necessary for copying DNA so bacteria can reproduce. Some have threadlike structures called flagella that they use to move. \n\n All viruses have a protein coat and a core of genetic material, either DNA or RNA. And that's it.\n\nViruses have to invade other cells and take their cellular machinery to reproduce. Viruses invade by attaching to a cell and injecting their genes or by being swallowed up by the cell. \n   \nT viral genes tell the bacterium to begin making new virus parts. These parts come together to make whole new viruses inside the bacterium. \n\nEventually so many new viruses are made that the E. coli bursts open and dies, releasing all those new viruses to infect more cells!
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Virology, often considered a part of microbiology, is the study of biological viruses: their structure and classification, their ways to infect and exploit cells to reproduce and cause disease, and their potential uses in research and therapy.\n\nA major branch of virology is virus classification. Viruses can be classified according to the host cell they infect: animals, plants (plant viruses), or bacteria (bacteriophages). Another classification uses the geometrical shape of their capsid (often a regular polyhedron such as an icosahedron) or the virus' structure (e.g. presence or absence of a lipid envelope). The shape and structure of viruses can be studied with electron microscopy, with NMR spectroscopy, and most importantly with X-ray crystallography.\n\nDefinitions of immunology on the Web:\n\nThe study of all aspects of the immune system including its structure and function, disorders of the immune system, blood banking, immunization and organ transplantation.\nwww.als.net/als101/glossary.asp\n\nStudy of the body's natural defense mechanisms against disease.\nwww.harthosp.org/cancer/glossary.html\n\nthe study of the body’s immune system and its functions and disorders.\nuuhsc.utah.edu/healthinfo/adult/path/glossary.htm\n\nThe study of the body's immune system.\nwww.stjude.org/glossary\n\nstudy of how the body resists infection and certain other diseases. Knowledge gained in this field is important to those cancer treatments based on the principles of immunology.\nwww.mesothelioma-settlement-information.org/Mesothelioma_Legal_Glossary.php\n\nA science that deals with the immune system.\nwww.ifopa.org/glossary.html\n\nThe branch of medicine that is concerned with the structure and function of the immune system and laboratory techniques involving the interaction of antigens with specific antibodies.\nwww.kurlama.com/glossary/i.html\n\nThe science that concerns the body’s mechanisms for protecting itself from abnormal or foreign substances.\nwww.nationalmssociety.org/I%20-%20N.asp\n\nScience concerned with understanding the immune system and the many factors that are involved with producing both acquired and innate immunity.\nscience.education.nih.gov/supplements/nih1/diseases/other/glossary/act1-gloss3.htm\n\nThe science or study of the body's system for fighting infection\nwww.cancerbacup.org.uk/Cancertype/Childrenscancers/General/Sometermsexplained\n\nconcerned with the body's response to an invading foreign substance; deals with the entire immune system. Intensive Care — special medial facilities, services, and maintaining devices to meet the needs of gravely ill patients. Internal Medicine — deals with diseases of internal origin, those not usually treated surgically. Invasive Cardiology — tests involving puncture or incision of the skin or insertion of an instrument or foreign material into the heart or blood vessels.\nwww.oregonhealthcarecareers.net/glossary.html
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A virus (not bacteria) is made up primarily of DNA and a protein coat.  They invade the cells of a living organism and destroy the host's DNA, then inject their own DNA into the host cell.  The result is that the infected cell produces new viruses which then exit the host cell and are released to infect others.  This is done because viruses do not contain cells with the orrganells and compounds necessary to reproduce, so they must get cells from the host to do the work for them.  Of course, the host cell is no longer functional as an intact cell once the virus leaves.
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The most significant difference is that Yeasts are Eukaryotic cells and Bacteria are Prokaryotic cells. \n\nWhat this basically means is that Yeasts have their DNA contained within a nucleus. Bacteria lack a nucleus and their DNA is more or less "loose" within their cytoplasm (although they do possess some measures to compact it so that it takes up less space.)
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Yes, viruses are alive. This is a fact, not an opinion. I am an atheist.\n\nIs a virus alive? \nYes - They reproduce which is a definite form of organization. True, they can not do it on their own, yet all living systems are open systems and depend upon their environment for survival. It is just that the environment a virus requires is another living cell. This is actually true for many symbiotic and parasitic cells. \nA virus is not a living machine . It is only part of a machine, namely the blueprints. The virus only provides the plans, the cell has done the real living work. Outside of its host the virus shows no living qualities.
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Virus is not a protozoa\nviruses are very smaller living organisms than protozoans.\nThese two are coming in different categories.
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There are loads to describe. Bacteria and viruses. What are the difference? I can tell you viruses always mutates and could harm you and need cells to depend on while bacteria multiply themselves in the bloodstream and they can harm you but unlike viruses they can also benefit you.
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Defining a species of virus is problematic because many biologists do not consider them to be alive.  It's the "organism" part of the species definition (any species definiton) that's a problem.\n\nDefining a species of bacteria under the biological species concept is problematic because the BSC defines a species as a collection of organisms that can reproduce only with other members of the same species.  Bacteria reproduce asexually, so they're not reproducing WITH anyone.  However, there are other problems with the BSC. For example, lions and tigers are clearly separate species, but they can interbreed.  So biologists tend to favor other species definitions (like the morphological species concept), which can effectively classify lions and tigers (as well as several other species that are able to interbreed).  These species definitions have no trouble classifying bacteria.
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all viruses work by taking over the reproductive mechanism of cells and making them manufacture copies of themselves.  Frequently the viral cells put out toxins that cause various illnesses.  "Stomach" viruses do this in the GI tract.
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Microbiology is the study of microorganisms, which are unicellular or cell-cluster microscopic organisms. This includes eukaryotes such as fungi and protists, and prokaryotes such as bacteria and certain algaes. Viruses, though not strictly classed as living organisms, are also studied[1].\n\nAlthough much is now known in the field of microbiology, advances are being made regularly. The most common estimates suggest that we have studied only about 1% of all of the microbes in any given environment. Thus, despite the fact that over three hundred years have passed since the discovery of microbes, the field of microbiology is clearly in its infancy relative to other biological disciplines such as zoology, botany and entomology.\n\nYou could get more information from the link below...
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A 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, but not 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 replicate 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.
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"Germ" is a layman's term used to describe any pathogen (infectious agent) that may cause disease.  It is synonymous with "bug" (as in stomach bug) or "microbe".  The word "germ" includes viruses, bacteria, and some fungus species.  \n\n"Virus" is a specific class of germs or microbes that require a living cell (e.g. a red blood cell, nasal mucosa) to replicate and are not considered independent living organisms. Viruses also differ from other germs in that they have no cell wall. Please read more about viruses in the link below.
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As a general rule viruses are more deadly, more infectious, and harder to cure.  Some bacteria like Mycobacterium tuberculosis (Tuberculosis), Bacillus anthracis (Anthrax), Yersina pestis (Black Plague) can all be more deadly than a common cold (Rhinovirus).  But viruses not bacteria are what occupy the highest level of containment, level four.  Viruses like small pox.
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Virology, often considered a part of microbiology, is the study of biological viruses: their structure and classification, their ways to infect and exploit cells to reproduce and cause disease, the techniques to isolate and culture them, and their potential uses in research and therapy. A researcher in virology is a virologist.\n\nMore at: