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.^




Meteorite NWA 10235 Nice new carbonaceous chondrite CV3
Meteorite NWA 10235 Nice new carbonaceous chondrite CV3

$1.25 (2 Bids)
3d 6h 4m remaining

CM2 fresh carbonaceous chondrite NWA11793 058gr rare primitive type w crust
CM2 fresh carbonaceous chondrite NWA11793 058gr rare primitive type w crust

$63.00
6d 19h 14m remaining

Meteorite NWA 11541 Carbonaceous Chondrite type CV3 Individual
Meteorite NWA 11541 Carbonaceous Chondrite type CV3 Individual

$0.01 (1 Bid)
6d 6h 6m remaining

NWA 12343 CV3 Carbonaceous chondrite Meteorite dark matrix 402g full stone
NWA 12343 CV3 Carbonaceous chondrite Meteorite dark matrix 402g full stone

$52.00
28d 4h 27m remaining

Meteorite NWA 11545 Carbonaceous Chondrite  Type CV3
Meteorite NWA 11545 Carbonaceous Chondrite Type CV3

$0.01 (1 Bid)
5d 6h 15m remaining

628 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 cut fragment
628 grams NWA 4502 Meteorite Carbonaceous chondrite CV3 cut fragment

$3.70
15d 14h 33m remaining

Meteorite NWA 11085 Rare very primitive carbonaceous chondrite  CO30
Meteorite NWA 11085 Rare very primitive carbonaceous chondrite CO30

$0.01
6d 6h 4m remaining

442 grams NWA 7020 Carbonaceous chondrite  CR2  Meteorite Northwest Africa
442 grams NWA 7020 Carbonaceous chondrite CR2 Meteorite Northwest Africa

$13.00
1d 12h 9m remaining

RARE NWA 2086 Meteorite CV3 Carbonaceous Chondrite 371 Grams
RARE NWA 2086 Meteorite CV3 Carbonaceous Chondrite 371 Grams

$11.99
3d 12h 2m remaining

15 small fragments of Carbonaceous CV3 Chondrite NWA 3118 weighing 037g
15 small fragments of Carbonaceous CV3 Chondrite NWA 3118 weighing 037g

$3.99
2d 11h 10m remaining

Carbonaceous Chondrite Meteorite CV3 194g
Carbonaceous Chondrite Meteorite CV3 194g

$100.00
28d 7h 3m remaining

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

$80.00
15d 14h 33m remaining



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