Carbonaceous Chondrite

JMDMT #2606 Microfossils of Cyanobacteria in Carbonaceous Meteorites

Chemistry will tell you that an amino acid is any molecule that has both carboxylic acid and amino functional groups. They are the basic building units of a protein. In biochemistry, the shorter and more general term is used to refer to alpha amino acids. Those are amino acids wherein the amino and carboxylate functionalities are attached to a common carbon. Amino acids' residue is what's left of an amino acid once a water molecule has been lost in the formation of a peptide bond. Peptides are polymer chains which form the protien in our bodies.

Twenty amino acids will be encoded by the standard genetic code. These are called proteinogenic or standard Amino [http://www.allamino.com] acids. More complicated ones are produced by our bodies, and are called nonstandard (these are not as common). Proline is the only proteinogenic amino acid, whose side group links to the a-amino group and is cyclic. This forms a secondary amino group. Before, proline was called "imino", which was misleading and was changed. Protiens contain other amino acids which are usually formed by post-translational modification (modifications AFTER translation). These modifications are essential for the function of protein. At least two amino acids, other than the standard 20, are sometimes incorporated into proteins during the translation process.

Even though only 20 amino acids are genetically encoded, over one hundred have been found in nature. Some of these have been seen in meteorites, especially in a type called carbonaceous chondrites. Microorganisms and plants can often produce somewhat uncommon amino acids, which are located in peptidic antibiotics. Lanthionine is a sulfide-bridged alanine dimer found along with unsaturated amino acids in "lantibiotics", which are antibiotic peptides of microbial origin.

As well as protein synthesis, amino acids have some other biologically important jobs. Glycine, and glutamate, are used as neurotransmitters as well as standard amino acids in proteins. Many amino acids take on the role of synthesizing other molecules, such as tryptophan, which is a precursor of the neurotransmitter serotonin, and glycine, one of the few reactants in the synthesis of porphyrins such as heme. Heme is in "hemoglobin", which is also important in the makeup of protein. Numerous, non-standard amino acids, are biologically important: "GABA",another neurotransmitter, carnitine, which is used in lipid transport within the cell, citrulline, ornithine, hydroxyproline, hydroxylysine, homocysteine, and sarcosine.

Feel free to reprint this article as long as you keep the article, this caption and author biography in tact with all hyperlinks.

Tyler Brooker is the owner and operator of All Amino [http://www.allamino.com] - [http://www.allamino.com], which is the best site on the internet for all Amino related information.

The ____ meteorites are believed to have solidified in the cooling exterior of a large molten asteroid (which?

subsequently was broken apart.)
1. iron

2. chondrite

3. chondrule

4. achondrite stone

5. carbonaceous chondrite

Do a search on Wikipedia for each of the answers and your answer will be shown.^




NWA 760 Carbonaceous CV3 Chondrite 0760 0006 017g w COA Rare Older NWA
NWA 760 Carbonaceous CV3 Chondrite 0760 0006 017g w COA Rare Older NWA

$0.99
6h 41m remaining

Allende 290 gram Endcut Stone Carbonaceous Chondrite CV3 Fell Feb 8 1969
Allende 290 gram Endcut Stone Carbonaceous Chondrite CV3 Fell Feb 8 1969

$50.00
5d 57m remaining

CO35 meteorite NWA 4540 slice 07 gram carbonaceous chondrite
CO35 meteorite NWA 4540 slice 07 gram carbonaceous chondrite

$40.00
10d 7h 28m remaining

Meteorite NWA 11535 Equilibrated Carbonaceous Chondrite  CK6 Full Slice
Meteorite NWA 11535 Equilibrated Carbonaceous Chondrite CK6 Full Slice

$155.00
1d 22h 3m remaining

NWA 801 Carbonaceous CR2 Chondrite 0801 0006 641g w COA Beautiful Class
NWA 801 Carbonaceous CR2 Chondrite 0801 0006 641g w COA Beautiful Class

$99.95
5d 7h 3m remaining

MURCHISON METEORITE CM2 CARBONACEOUS CHONDRITE 12 GRAMS BARN ROOF HAMMER
MURCHISON METEORITE CM2 CARBONACEOUS CHONDRITE 12 GRAMS BARN ROOF HAMMER

$355.00
29d 21h 51m remaining

217 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 as found in Africa
217 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 as found in Africa

$125.00
20d 20h 28m remaining

NWA 10055 Carbonaceous CV3 Chondrite G519 0007 605g w COA Most Beautiful
NWA 10055 Carbonaceous CV3 Chondrite G519 0007 605g w COA Most Beautiful

$150.95
21d 1h 14m remaining

NWA 10588 Carbonaceous CK3 Chondrite G654 0018 403g w COA Number 31 EVER
NWA 10588 Carbonaceous CK3 Chondrite G654 0018 403g w COA Number 31 EVER

$59.95
21d 1h 37m remaining

325 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 as found in Africa
325 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 as found in Africa

$159.00
20d 20h 28m remaining

NWA 5515 Carbonaceous CK4 Chondrite 5515 0047 133g w COA Extremely Rare
NWA 5515 Carbonaceous CK4 Chondrite 5515 0047 133g w COA Extremely Rare

$1.95
4d 4h 37m remaining

NWA 801 Carbonaceous CR2 Chondrite 0801 0009 363g w COA Beautiful Class
NWA 801 Carbonaceous CR2 Chondrite 0801 0009 363g w COA Beautiful Class

$179.95
2d 22h 15m remaining



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