why do cells need more genes than viruses?
81167
Think!!! \n\nIf u did not have so many genes, then u wud have been a virus urself!! No offence meant!!!\n\nViruses actually need their genes for "survival" (if u can call it), proliferation eventually destruction. They are obligate parasites.\n\nCells need genes for a lot more functions than viruses. So, the reason is obvious.
139576
Although differentiated cells have the entire genome of the organism (yes, there are exceptions, but don't worry about that now), many parts of it are inactived, and this inactivation is hard to undo. Thus, a muscle cell has the genes for a neuron, but it can't use them, and we can't figure out how to undo this programing.\n\nAs for HIV, it is a virus, and it just uses our genes for lipid synthesis.
944345
mRNA is essentially the "working copy" that gets actually used to guide protein synthesis.  It's like keeping a master schedule on your computer.  You wouldn't have everyone consult your computer to see the schedule, you'd print them a copy, and keep the schedule safe on your computer.\n\nThe other purpose of mRNA is to control protein expression.  You've got your one set of DNA, with (for most genes) one copy of every gene your body needs.  But any given cell wants to express only certain proteins, and how much of a certain protein is wanted depends on the cell type, and wha't going on in the life of the cell.\n\nSo if a cell wants lots of a gene product, it makes lots of mRNA.  And if it doesn't want to express a gene at all, it makes none.
877953
If an entire species has the same gene, they would all be the same. So if the species was hit with a disease they are vulnerable to, all of them would die because none of them could develop an immunity against it. Gene difference also allows more changes for mutation which is important for long term survival.
367737
A virus needs to be able to enter the cell in some form or fashion. An e.coil phage will inject its genetic material into the bacterial cell. For animal viruses, many times the virus will fuse with the host cell and enter that way. Once a virus; more importantly the viral DNA is inside the cell, replication is achieved when the viral DNA can be replicated using the host cells organelles. Inside the cell it is a race for the Viral DNA to be replicated before the cells defenses realize there is material in the cell that doesn't belong. Once the viral DNA is replicated, that DNA is taken to the ribosomes where viral proteins are made, and those proteins will eventually be put together to make a new virus.
532682
if the system is so perfect why is evolution necessary?? and if you dont believe the man from monkeys thing, what about viruses and why we need new flu shots every year??
841754
Very simple.  There is no biological mechanism by which knowledge and experience can pass to a new life form.  All things biological pass through the bottleneck of the single cell that becomes the new offspring ... so they must be encodable in genes.  There is no way for things that you learn in your life, to be encoded in your genes (your DNA), that you pass on to your offspring.\n\nThat is why imitation and language transcends biological evolution ... it is a way to pass knowledge to new offspring *outside* of biology (genes).
762553
gene is the DNA or RNA in animals cell
928880
More importantly, large multicellular organisms have "specialized" cells. This means that if you took the average cell from the body it would simply die since most cells have outsourced various things to cells that can do it more efficiently. Blood for transporting oxygen, muscle cells for movement, etc.
842572
The cells are usually designed for its purpose for the body. For example, your red blood cells doesn't have several key organelles that other cells have (sorry I forgot the organelles) because they have a short life span. Throughout biology, there is a recurring theme that the form of an organism usually fits its function. That’s why the cell's shape usually fits its function. Also, natural selection favors those with superior qualities.
627823
You probably mean "why can't we kill viruses?" Right?\n\nThe problem is that viruses tend to live inside host cells. To destroy the virus you need to destroy the cell.  Viruses also modify cell receptors so they can't properly work, which limits the ability to find something that can both penetrate the cell and kill the virus without damaging the functions of the cell.
359498
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.
753695
I think the two studies are very important.  Both involve a newly introduced organism into a cell, where it takes over the current cell machinery in order to benefit itself.\n\nDepending on your favorite organism, one takes over the cell's genome, and the other uses your cell as it's new embryonic yolk sac.\n\nThese are pretty impotant processes, considering in the meantime they cause tons of human pathologies.
280912
Antibiotics are so successful because they exploit differences in physiology between bacterial and human cells. They interfere with biochemical processes which bacteria have, but not humans, e.g. construction of bacterial cell walls.\nViruses do not have the structures and biochemical processes the antibiotics interfere with, so you throw a ton of antibiotics on them and they won't care.
507551
For any kind of cancer it has to do with the cells, now each cell has a copy of DNA, but it duplicates this in the form of RNA and sends that arround the cell to do the going ons.  However cancer results when a certain part of the RNA is miss duplicated, this dosn;t happen very often respectivley since there is somthing that goes over the RNA to make sure it is correct.  However when that substance has a problem it cannot check the RNA and therefore cancer is much more likley.  Because cancer is the rapid reproduction of cells and when the RNA dosn't tell the cell to stop reproducing it makes more and more cells.  Things like ciggarets destroy the substance making them much more likley to get cancer.  So ya thats just a really breif crash course, i reckon you google it if you have anymore questions.
13121
To propagate one's DNA. Without this act, there would be no life. So that better be the focus of it, if you want to have a life.
119760
they thoguht they needed more genes to code for all the proteins we have, but what actually happens is in genes there are "junk" sections that code for nothing and are removed when copied, but what actually happens is that different cells spice the sections differently, picking to kepp some "junk"parts, makeing totally different proteins from the same gene. This is an explaination of why there are less genes than they thought, it is not an unexplained miracle