Why does virus form an exceptions to a cell theory?
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Asked in Cell Biology (cytology)
What does the cell theory tell you about where these cells came from?
What is a cell in which a virus multiplies intself?
Asked in Genetics
How did improvements in the microscope help scientists form the cell theory?
Asked in History of Science, Genetics
How did theodor schwan contribute to the cell theory?
Do viruses have to have a host cell to replicate?
Asked in Health, Biology, Viruses (biological)
Describe the metabolism of a virus NOT inside a cell?
Asked in Biology
The exceptions to the rule that every chromosome is part if a homologous pair are the?
Asked in Biology, Earth Sciences, Genetics
What was Virchow's contribution to the cell theory?
Asked in Genetics, Cell Biology (cytology)
How do viruses reproduce in humans?
Viruses first much attach to the host cell, they then must be adsorbed by way of special sites that recognize the virus. After adsorption, penetration occurs and the virus is taken into the cell. It uncoates and begins the process of synthesis of its' own genetic materials and proteins. The next step is maturation or assembly of the virus into its' mature form. The virus fills the cell and begins to leave by "budding". It begins the cycle again by infecting more cells.
Asked in Conditions and Diseases
Steps which a active virus copies itself and destroys a cell?
The virus attaches to a specific host cell. Then the virus's hereditary material enters the host cell. Then the virus's hereditary material causes the cell to make viral hereditary material and proteins. Then new viruses form inside of the host cell. Then the new viruses are released as the host cell bursts open and is destroyed. there are so many then in my witing
Asked in Microbiology, Genetics
What are the six stages of Bacteriophage attacking the cell?
Asked in Astronomy
What can disprove the solar nebula theory hypothesis?
Although the nebula theory is widely accepted, there are some exceptions to that theory that scientists simply have no answer for. The three exceptions to the nebula theory are Uranus, Neptune, and the Kuiper Belt. According to the nebula theory, the inner planets formed when metals condensed into the inner planets, and the gas giant, Jupter and Saturn, formed when gasses condensed. However, because of the gravitational snowball effect due to the masses of Jupiter and Saturn, there simply should not have been enough gas for Uranus and Neptune to form according to the nebula theory. Also, all the rocky particles should have condensed to form the inner planets, so there should not be a belt like the Kuiper belt at all past Neptune. But there is, which contradics the nebula theory.
Asked in Microbiology
What happens when RNA is extracted from a virus is injected into a host cell?
Without the viral enzyme reverse transcriptase probable nothing. RNA viruses are retroviruses because they nee reverse tanscriptase to make a DNA copy from the RNA that is inserted into the cell. Generally to form a provirus. Now if you injected DNA from a regular virus then it would be as if the virus did it itself.
Asked in Microbiology, Viruses (biological)
Is a bacteria worse than a virus?
No a virus is generally much worse than a bacterial. Bacterial are single celled organisms that are very big compared to a virus. You can kill bacterial in many ways such as antibiotics which make the bacteria cell walls burst, or with heat, cold UV light, silver or radiation. Bacteria reproduce by cell division so 1 becomes 2, 2 become 4 etc. A virus is not really a life form, it is just DNA in a thin membrane. The virus can enter a cell in the body where it hijacks the natural mechanisms inside the cell and uses them to replicate the virus DNA, This goes on until the cell is full of virus and eventually bursts releasing them so they can infect other cells. So where bacteria can multiple quickly by division, A virus can multiple very quickly by using the host organism to replicate it. Many thousands of viruses can be made by a single cell. Mankind has cures and treatments for thousands of bacteria but has only ever eradicated one virus. The smallpox virus. We can treat people for viral infections which block the virus entering the cells or we can use drugs which slow down or stop the replication of a virus when it is inside a cell, but mainly it is down to the immune system to defeat a virus. Inoculations against a virus expose the immune system to parts of a virus or a similar but harmless virus, so if we become infected by that particlular virus in the future. the immune system will recognise it straight away and start to fight it. But this does not mean we are always immune to that virus, The immune system can still loose the fight!
Asked in Medication and Drugs, Antibiotics
Why antibiotics work against bacteria but not viruses?
1. D. Antibiotics do not work on viruses because viruses are not alive. A bacterium is a living, reproducing life form. A virus is just a piece of DNA (or RNA). A virus injects its DNA into a living cell and has that cell reproduce more of the viral DNA. With a virus there is nothing to "kill," so antibiotics don't work on it.