Mentatzoee wrote...
I still wonder about how having dextro amino acids would mean they'd taste sweet. I mean... I keep thinking they might have different proteins, thus different enzymes, then they wouldn't be able to break the same chains we break but still... I don't believe this should infuence them in tasting sweeter, since it's not sugar related.
Also, I can believe they wouldn't be able to digest the same things we do because of this enzyme difference but I don't know what to think about stuff like ethanol.
I'm no expert (or do know anything about it but I like to think about this stuff) if there's someone who knows more about this kind of things, I'd really like to have a chat! 
Dextro amino acids wouldn't mean a Turian tastes sweet. It's just an offshoot of the fact that sugars have a dextro-rotary alignment. Not even all sugars are dextro-rotary either and sometimes they are both. Anyway, I think people just took that fact about sugars and applied it to amino acids 'cause it's funny?
I'm inclined to think dextro amino acids simply would have no taste. The taste buds have to recognize the molecular pattern and if the molecules are a mirror of levo amino acids, they simply don't fit. Trace your left hand on a sheet of paper. Think of that traced hand on the paper as your taste buds. Now put your right hand over it. It doesn't fit, therefor it's likely not recognized as having any taste at all.
Also, dextro amino acids do exist on Earth created from a process of racemization and can indicate aging.
I assume the toxicity aspect of the dextro amino acids in ME is actually derived from the toxic implications of other molecular chiralities such as found in medications. Many medications have both the dextro and levo forms with only one form actually being processed by your system while the other is ignored. However, severe complications have occurred in medications that have contained both forms, showing they're not always ignored.
Modifié par Pacifien, 10 juillet 2010 - 07:19 .