Biology questions about viruses?
Why ae viruses not considered to be life forms? Why are they life-like?
Hoe does the body protect itself against disease causing viruses? (Describe an immune response)
How does a vaccination "prevent" viral illness?
Why is it difficult to produce vaccines o viral diseases such as the adenovirus (cold) or HIV?
How do lytic vs lysogenic viruses differ?
Posted by mfreedman88
Viruses are not considered life forms because they are not capable of replicating on their own, they require a host to replicate their genetic material (and this is necessary to truly be considered life)
However, they are considered life-like because they are capable of passing on genetic material, mutating/adapting to environments, surviavl, and other necessites for life (can't remember them all)
the body can protect itself from viruses in different ways... one of the most common ways that is specific to a specific virus is through antigen recognition... this involves the processing of foreign proteins present on the virus, that the body recognizes as foreign, and processing of it (processing means chewing it up, finding the segment that can be recognized, producing an antibody specific for that antigen, producing T-cells specific to fight off cells expressing those particular antigens that are infected by the virus, and killing them)
it is difficult to produce vaccnes to viral diseases for several reason... first off they constantly mutate during reputation, so the antigen is constantly changing, making it difficult for the body to produce antibodies specific for it... however, for diseases like Aids/HIV, these particular viruses have adapted ways of evading the techniques taken by your body to combat it... i.e. by preventing an immune cell from presenting the antigen to other immune cells to trigger destruction (if you need more detail just ask and I cna provide it, its just a little more in depth than it seems you need to know)
lytic vs lsogenic is differnet in the stage they are in.... I sometimes get which one is whihc mixed up, but I belive that lytic cycle is more dormant... the virus enters a cell, produces copies of itself and lives insie the cell... the cell can then enter the lysogenic cycle, with is when the cell lyses/bursts, releasing the viral components to the surroundings to infect other cells... killing the cell it invaded
Posted by reddragonn2006
man don't you have friend to explain all of that these are an awfull lot of question in 1 post
viruses are not life forms because they work like machines they have a single strand of dna that is supose to mix with that of the host cell
they are life like cause they get born they die and multiply
dunno if the body can protect against them usually at cellular level they can be rejected by the membrane
a vaccination prevents ilness by modifiing the membrane of the cell making the virus incapable of penetrating the outerwall
because the dna of viruses constantly mutate being hard to trace theyr paterns
can't answer last i've never heard but it's probably based on theyr composition
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