Immunizations work by pre-infecting the body so it knows how to produce the right antibodies as soon as the virus starts reproducing. Also, because viruses reproduce so quickly and so often, they can often change slightly. Sometimes, mistakes creep into their genetic instructions. These changes ...
How does a virus reproduce?Question:How does a virus reproduce?Virus:Viruses are microscopic obligate parasites which thought to occur as a link between the living and the non-living because these organisms are inert outside their host but came to their living state inside the host body. These...
Like allviruses, HIV treads the fine line that separates living things from nonliving things. Viruses lack the chemical machinery that human cells use to support life. So, HIV requires a host cell to stay alive and replicate. To reproduce, the virus creates new virus particles inside a host ...
1/1 D七选五:根据短文内容,从选项中选出能填入空白处的最佳选项,选项中有两项为多余选项。What is a virus, and how doe
How does a DNA virus reproduce its host genome?Genomes:Genomes are collections of nucleic acid that store an organism's biological information. Small changes to an organism's genome can have very large effects on the organism's ability to reproduce....
We say someone is immune to a virus or bacteria when they have antibodies in their blood ready to fight the pathogen as soon as it enters the body. As soon as the immune system recognises the pathogen it creates antibodies to fight it very quickly, so the infected person probably doesn’...
How to Prevent a ColdWinter is coming,so flu virus is spreading quickly and many students have fallen ill.Here are a few suggestions to help you away from flu.(说明现象)First,keep away from the crowded public places if possible.Such places are often polluted,which provide the best condition...
In the United States, however, the rise of West Nile Virus has moved mosquitoes from the "simply annoying" list onto the "danger" list, and they are now something to be feared. Disease danger has always been the case in tropical regions, where the main mosquito-borne parasite is malaria....
Helper T cells are the cells the AIDS virus attacks -- you can imagine that destroying the cells that direct the immune system has a devastating effect. Cytotoxic T cells - Cytotoxic T cells release chemicals that break open and kill invading organisms. Memory T cells - Memory T cells ...
A type of virus had taken over the insect and turned it into a single-minded virus-spreading vessel. Article content The baculovirus halts a caterpillar’s moulting activity, encouraging it to keep eating and get bigger, which creates more of the virus. When the caterpillar is sufficiently mas...