Naked Science Forum

Life Sciences => Cells, Microbes & Viruses => Topic started by: Nelly on 15/10/2003 04:42:06

Title: The composition and structure of DNA
Post by: Nelly on 15/10/2003 04:42:06
Why is DNA missing oxygen on carbon number two, and what would happen if this carbon was added? Why is RNA not missing this oxygen ?
Title: Re: The composition and structure of DNA
Post by: Quantumcat on 15/10/2003 20:52:43
Because That's The Way Things Are (in other words - I don't know [shame on me])

Am I dead? Am I alive? I'm both!
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.stupid-boy.com%2Fsmilies%2Fkao%2Fotn%2Fcat.gif&hash=e4b91a72c020cc1c5d28487fff5428f1)
Title: Re: The composition and structure of DNA
Post by: chris on 16/10/2003 00:19:31
They are 2 different sugars (ribose in RNA and deoxyribose in DNA).

Chris

"I never forget a face, but in your case I'll make an exception"
 - Groucho Marx
Title: Re: The composition and structure of DNA
Post by: Quantumcat on 16/10/2003 13:21:09
Oh is that what she meant?

Am I dead? Am I alive? I'm both!
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.stupid-boy.com%2Fsmilies%2Fkao%2Fotn%2Fcat.gif&hash=e4b91a72c020cc1c5d28487fff5428f1)
Title: Re: The composition and structure of DNA
Post by: tom on 16/10/2003 13:27:23
quote:
Originally posted by Nelly

Why is DNA missing oygen on carbon number two? and what if this carbon was added. Why does RNA not missing this carbon?


Because of absence of 2' OH group:
-DNA can addopt B-form of double helix (RNA cannot), form that allows all proceses on DNA
-DNA is more stable - doesn't hydrolyse like RNA and so is suitable to be a carrier of genetic information......
Enough?
Tom
Title: Re: The composition and structure of DNA
Post by: Quantumcat on 16/10/2003 13:29:58
Ahhhh a better explanation.

Am I dead? Am I alive? I'm both!
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fwww.stupid-boy.com%2Fsmilies%2Fkao%2Fotn%2Fcat.gif&hash=e4b91a72c020cc1c5d28487fff5428f1)