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[BBC] Classic 'life chemistry' experiment still excites - Page 2

post #11 of 18
Quote:
Originally Posted by Juliancahillane View Post
^^^ because thinking you know whats going to happen, doesnt mean you know exactly how its going to happen, and its only a prediction at the end of the day.It still doesnt take away from what an exeptional discovery it was. You might know whats happens in a car crash but im sure it still going to startle you when your brains are all over the car

Im sure it doesnt really matter what tyoe of amino acids are produced, anyone with a brain know that amino acids are amino acids, hence the building blocks of life where created. Only a religion would try and blindly argue against solid evidence like so, clutching at any slight chance the discoverys that drive us forward are incorrect.
That's not right. The main amino acids (except glycine) are isomers, coming in the "L" isomer form or "D" form. While the "D" is used in certain areas of nature, such as parts of bacteria cell walls, "L" is almost exclusively used in proteins.

The chirality of the produced amino acids IS significant.
post #12 of 18
I'm not going to make a stance in the argument, but...

Anyone who has taken college level organic chemistry knows that the chirality of a molecule is vital to the molecules functions. For example, the molecule that gives the taste of oranges is very close to lemons, but they are mirror images of each other.

The same can be said for amino acids. If the amino acids are not in the correct orientation, then they can be dangerous to life forms.
post #13 of 18
Quote:
Originally Posted by Juliancahillane View Post
^^^ because thinking you know whats going to happen, doesnt mean you know exactly how its going to happen, and its only a prediction at the end of the day.It still doesnt take away from what an exeptional discovery it was. You might know whats happens in a car crash but im sure it still going to startle you when your brains are all over the car

Im sure it doesnt really matter what tyoe of amino acids are produced, anyone with a brain know that amino acids are amino acids, hence the building blocks of life where created. Only a religion would try and blindly argue against solid evidence like so, clutching at any slight chance the discoverys that drive us forward are incorrect.
I wasn't saying which way or another about religion or lack there of. I was saying the validity of this experiment has been questioned and argued for and against by the scientific community with much more scrutiny in the latter decades since it was conducted.
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post #14 of 18
Quote:
Originally Posted by stumped View Post
wasn't this discredited due to organinc amino acids being left handed (or right handed, i can't remember) in the way they branched and the experiment resulted in amino acids that were oriented the opposite way?

And hasn't the theorized chemical make up of the early earth atmosphere been changed to levels that wouldn't have allowed this to happen?
not paying attention. nvm.
Edited by MrTolkinghorn - 3/22/11 at 8:28pm
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post #15 of 18
Biological amino acids are chiral because they are produced by enzymes. These amino acids were produced by purely chemical means. A racemic mixture of both chiralities is expected.

Just because they are of a mixed chirality does not mean that they are unable to produce functional proteins. Bacteria and Archaea are known to mix chiralities of amino acids.
    
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post #16 of 18
Quote:
Originally Posted by MrTolkinghorn View Post
Some of the amino acids that were created by his experiment, actually, were cyanide and formaldehyde, which is what they use in embalming fluid lol.

...we haven't even figured out in all our years using whatever resource is available to make life...
Neither cyanide, nor formaldehyde are amino acids...

Formaldehyde is very volatile and would evaporate. Cyanide is toxic to the electron transport chain, a critical part of metabolism in aerobic organisms. Primordial Earth was not an aerobic environment. Cyanide would not be toxic to anything able to live in an anaerobic environment.

In all our years? I would say that modern biochemistry has only existed since the mid 70's. I only know of one scientist who has embarked on the quest to make synthetic life, Craig Venter. And he isn't making it from scratch. He is modifying the smallest genome known to man to get down to what he calls "the basic chasis of life". He will then build back up from there to make custom microbes that are useful in industry which have no unwanted baggage or traits.

There is no grant money in trying to create life. I don't think anybody has honestly tried. It's a pointless endeavor that is most likely going to fail. Why squander a scientific career on such a pointless and nearly impossible project?

There have been completely novel self replicating enzymes that have been created in the lab. That is the critical function of life.
Edited by Epitope - 3/22/11 at 3:52pm
    
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post #17 of 18
I love how a bunch of posts were deleted. Not allowed to have fun anymore, this is extreme serious business now.
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post #18 of 18
Quote:
Originally Posted by Epitope View Post
Neither cyanide, nor formaldehyde are amino acids...

Formaldehyde is very volatile and would evaporate. Cyanide is toxic to the electron transport chain, a critical part of metabolism in aerobic organisms. Primordial Earth was not an aerobic environment. Cyanide would not be toxic to anything able to live in an anaerobic environment.

In all our years? I would say that modern biochemistry has only existed since the mid 70's. I only know of one scientist who has embarked on the quest to make synthetic life, Craig Venter. And he isn't making it from scratch. He is modifying the smallest genome known to man to get down to what he calls "the basic chasis of life". He will then build back up from there to make custom microbes that are useful in industry which have no unwanted baggage or traits.

There is no grant money in trying to create life. I don't think anybody has honestly tried. It's a pointless endeavor that is most likely going to fail. Why squander a scientific career on such a pointless and nearly impossible project?

There have been completely novel self replicating enzymes that have been created in the lab. That is the critical function of life.
Clearly, I'm thinking of the wrong experiment then. lolz, I'm certainly not paying attention. I know there was one guy who did something kinda like this though. Not really sure which one I read about though, so discard what I'm saying lol.
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