2552>I don't really get it so could someone answer by tomorrow it is homework
Reply:they bind to receptors and get internalized.
they all need host replication machinery to complete their reproductive cycle
Reply:The Virus is an "obligate intracellular parasite" for they can reproduce only within a host cell, never on their own.
(Lytic Cycle)
The virus itself does not enter the cell, but injects its DNA into the host cell, leaving the capsid outside of the cell membrane. It then takes control of transcription and translation of proteirns. Eventually the cell is destroyed.
Reply:A virus is defined as any of a various number of submicroscopic parasites that can infect any animal, plant or bacteria and often lead to very serious or even deadly diseases. A virus consists of a core of RNA or DNA, generally surrounded by a protein, lipid or glycoprotein coat, or some combination of the three. No virus can replicate without the help of a host cell, and though they can be spread, viruses lack the ability of self-reproduction and are not always considered to be living organisms in the regular sense.
though the smallest viruses are only about one-millionth of an inch long, they live up to their Latin namesake鈥攑oison. They are capable of infecting and hijacking a human body, creating health hazards as minor as the common flu and as disastrous as the AIDS epidemic.
On the inside
Viruses are neatly organized, petite packages of genetic material, shaped like rods, filaments, harpoons, or spheres.
Proteins surround the package, which is called a capsid. Some viruses have an added layer of lipids that coat the capsid. Little extensions on the virus are called antigens, which help the virus hunt down the target host cell [3-D anatomy of HIV].
The diminutive nature of viruses, with the exception of the relatively gargantuan mimivirus, has made determining their looks difficult. The invention of the electron microscope in the 1940s first made viruses visible.
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