They code for both –
No, they code for proteins. They never code for amino acids.
I quoted a reputable college, with a reputable explanation.
Reality trumps any authority.
The enzymes which are involved (usually three or more) in the synthesis OF AMINO ACIDS are built by instructions found in the genetic code. Whether the genetic code does the act directly or indirectly is irrelevant – it does it in some way.
Most organisms, there are required amino acids that cannot be produced by the organism. Amino acids are not made by nucleic acids, and as you learned, there was no need for nucleic acids to make them in abiogenesis, since they can form abiotically.
and by the way, D amino acids aren’t the only possible poisons in a watery soup.
You still have to show us that they are poisons at all.
You seem to think nothing can poison these first critters which had no time to evolve any defence mechanisms at all…
I already told you oxygen could poison them. We have evidence for that. All we have is your imagination for D-forms.
All proteins are built out of amino acids. No amino acids means no proteins. = DEAD organism. All these extra steps just make the problem WORSE not better for you
Biochemists don’t think so. They think that this breakthrough was an important step in understanding abiogenesis. But then, they actually do biochemistry.
No. In mammals, ten amino acids are “essential”, i.e. they must be obtained in our diet. Ten others are “nonessential” and can be synthesized. None, however, are produced by nucleic acids.
Interesting that you keep digging up facts associated with organisms which are far more advanced than any possible FIRST ORGANISM
Refinements in organisms tend to make them more fragile and less adaptable.
Barbarian on the abiotic formation of amino acids:
And yet, there it is, in the meteorite. Reality trumps anyone’s judgement.
And yet you quote an article which disputes the validity of that assesment ?!
No. Why would I do that?
Barbarian on the first amino acids used by living things:
The evidence suggests that there were 11 to 15, including most that were synthesized in Miller-Urey.
And yet they are nameless,
and their quantities unknown?
Could you give me “quantities” for all the amino acids existing today? No?
As you saw, D-forms don’t do much of anything.
In rat perhaps – but in the line I quoted you, clearly even in an ADVANCED HUMAN quite a few D-forms are poisonous. That’s why our kidneys break them down to get rid of them
Kidneys? You mean liver? Kidneys filter out things, but don’t really detoxify anything I know of. Which D-forms poison humans?
But kidneys are made by genetic code which the original life form didn’t have? So it stands to reason that no less D forms were poisonous
So, which D-form can you actually show to be poisonous? As you saw, the first one I checked, wasn’t.
Obviously at least one is poisonous
But you don’t know of any?
Since all life works quite hard to get RID of the vast majority of D forms – there must be a reason it is bad to have them around.
You’re still assuming what you intended to prove.
Remember I am accusing you of imagining this first creature
Then you’ve jumped over what I said, to what you’ve imagined I said.
I don’t have to know what is in it –
Or even know which D-form amino acids (if any) are poisonous.
– there is not even a collection of these theories which could produce a valid life form which would not be poisoned by its environment.
The banded iron formations clearly show that very early organisms were frequently poisoned by their environment.
Human kidneys contain enzymes that can break down D-amino acids, essentially removing them from the body
Because, no doubt, they once existed. But now, they don’t, except in very exceptional cases.
Hello? what once existed but now does not?
I restored the context you deleted. I hope you don’t mind.
Amino acids, as you learned, can form abiotically.
No, I always knew they formed abiotically.
If so, you seemed remarkably reluctant to admit it.
That’s not the problem with the snowjob argument you have pursued. The problem is that the bad forms are nearly equal to the good forms. How then did the first life form simultaneously come up with multiple amino acid handling mechanisms ?
How did they take up nutrients and not things that weren’t nutritious? Maybe some did. They died, and didn’t leave descendants.
Barbarian on how organisms dealt with things that weren’t nutrients:
Or just excreted it. Or never took it up in the first place. You have no idea.
Uh – yeah – I do. The good forms SPONTANEOUSLY convert to the bad forms over time.
Don’t see that in the literature.
And since life does not generally tolerate D-aminos
I know you want us to believe it, but you can’t even show us one example.
(It is a simple matter to remove the genetic code for producing certain D destroying enzymes in bacteria… some experiments along this line have been done. I seem to remember amylase or something like that in yeast – there are probably other experiments…)
Amylase is an enzyme that breaks down starch. No amino acids there.
And how much d-form amino acid do you think there is?
And I already pointed out even in mammals some D forms are in fact poisons
But you couldn’t name even one? What makes you think they exist?