Haha...well alright ...if you insist and can't take my word for it...but don't have any of my bio books... And wikipedia isn't that great either...but I guess I don't have too many chioice. http://en.wikipedia.org/wiki/RNAOriginally Posted by Chathurga
Lets first look at the ribose sugar as single component, http://en.wikipedia.org/wiki/Ribose, where you have Oxygen in either a ketone( (2)R-C=O), aldehyde(H-C=O) or many cases a ether conformations (C-O-C). For ribose to be used in RNA as building black bone, it must be in ether conformation where, a high energy reaction (molecular wise) must take place for not only ribose to be in a ether conformation but also for O-C bond to be broken and phosphate to be added. (O-C are high energy bond, can't be broken easily) Thus making the all famous phophodiester bond (O-P-O). And where do you think that phosphate comes from? Two places I know of, phosphoric acid (crossive!) and or inorganic phostphates, which aren't that scarce, but you almost never find inorganic phosphate just becuase it reacts with pretty much everything (including water).
I'll admit, ribose when looking at the structure can be made in nature by chance alone, but its scarce. You just don't find a sugar like that randomly, it usually has some biological matter behind it. But all those nuclelic acid being randomly occuring without some biological activity...nope....and then all the Amino acids needed for normal metabolism...makes you wonder where it all started...
RNA has been named the precurror to DNA and the genetic material of the early cells.
Do you really think that pre-early cells, when they were deciding on a genetic material because they didn't have any at that point, randomly stumbled upon all the precurssors of RNA: Ribos, all the nuclelic acids, protiens, catalysts...etc randomly? RNA synthesis is pretty complex which I really don't want to go into detail, it requires a handfull of catalysts alone, which guess what? requires genes to encode them.... But RNA is a very special molecule, some of RNA that gets encoded from DNA don't translates into genes, it becomes sometype of catalyst that catalyses more RNA (ie Ribosomes).
(I know im going to have a lot of grammer mistakes in it...but bear with me)