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Exception to Characteristics of Life.

Debate and discussion of any biological questions not pertaining to a particular topic.

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Postby thank.darwin » Thu Feb 10, 2005 9:12 pm

What are DNA sequencers? (I'm only in my first year of biology -we haven't gone over anything like that)
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Postby RobJim » Sun Feb 13, 2005 10:03 pm

DNA sequencers are machines that read DNA and then report to scientists what the sequence of bases is in the DNA.

They do not replicate themselves; nor are they alive. What they do is replicate strands of DNA that are in the machine in order to read it.

Take a look at this website:

http://infohost.nmt.edu/~biology/sequencer.htm
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Postby thank.darwin » Tue Feb 15, 2005 9:29 pm

Thank-you RobJim, that helped a lot!
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
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Postby Moff231Dawrin » Sat Feb 19, 2005 5:15 pm

DNA sequencers sound like they're a special type of protein. if so, then wouldn't they have at least some DNa or RNA, because I thought proteins were made from ammino acids?
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Postby mith » Sat Feb 19, 2005 7:35 pm

Read the info at the link and the posting itself. Both will tell you the sequencer is machine.
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Postby Moff231Dawrin » Sat Feb 19, 2005 10:10 pm

oops. my bad. I was thinking about helicases.
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Postby MrMistery » Thu Mar 03, 2005 11:09 pm

The viruses have been up for debate for a long time: nobody was able to determin if they are alive or not, so in the present they are called infectious entities. It is also true that viruses can contain DNA or RNA but they do not have their own methabolism nor are they capable of reproduction. But think of it: are viruses more alive than the printer or the computer monitor? Of course they are. Also, they are less alive than a bird or a toad. So, my personal opinion is that if you look at life as angradual state then both viruses and prions(which, from what i know do not contain DNA or RNA) can be alive, but at different levels. This is how i see this problem. I don't know if anyone understands anything from what I just wrote, I hope yes.

By the way, someone mentioned red blood cells. You first have to consider that red blood cells have a nucleus at all animals except mamals. But, i consider them as being part of life and not life itself. If a cell is alive than can you consider the mithocondrion inside it alive(maybe it's not the best example since it is a known fact that mithocondrion are primitive bacteria which have come into symbiothis with the cell a long long time ago- anyway, you see my point)
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Postby Lee » Sat Mar 05, 2005 11:36 am

virus i think
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Postby RobJim » Sat Mar 05, 2005 1:48 pm

I believe that viruses are not considered alive, as they don't fit the definition of life.
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Postby Poison » Sat Mar 05, 2005 1:49 pm

yes RobJim thats right. We discussed this so far.
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How charged with punishment the scroll
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I am the Captain of my soul.
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Postby Dr.Doom » Sun Mar 06, 2005 7:39 am

Viruses do have genetic material (ssRNA, ssDNA ...etc). Prions are proteins; they do multiple through protein-protein. All other animate objects have genetic material (yes even fungus); therefore, the cloest thing may be a prion, but i don't know if you can consider that as an animate object.
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Postby thank.darwin » Sun Mar 06, 2005 4:53 pm

Right Dr.Doom... :D
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
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