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Also- -What is a group of a molecule? -What are carboxyl and amino groups of a molecule?
amino acids make up proteins. Nucleotides make up nucleic acids.
Evolution-wise, which arose first?
Amino acids are organic molecules that contains an amine group, a carboxylic acid group, and a side-chain that is specific to each amino acid. The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen.
Thank you, but see my second set of questions.
Nucleic acids are biological molecules essential for known forms of life on Earth. They include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). Together with proteins, nucleic acids are the most important biological macromolecules; each is found in abundance in all living things, where they function in encoding, transmitting and expressing genetic information.
I understand that far.
Carboxyl group :-COOH Amino group: -NH2
http://en.wikipedia.org/wiki/Amino_acid#Non-protein_functions apparently some amino acids they are precursors of nucleotides.
It's hard to say - some people think that the first life forms were self-replicating RNA molecules, meaning nucleic acids came first. No one knows for sure the right answer.
@00Gibb00 http://upload.wikimedia.org/wikipedia/commons/b/b5/Carboxylic-acid.svg so is the R not actually the Carboxyl group, just the thing it's attached to? What precisely defines a group?
According to evolution amino acid appears first then after nucleic acid came into existance
R depends on the amino acid in question. All amino acids have some basic features in common - the carboxyl and amino groups. What makes them different from one another is the composition of the R group. A "group" is just a collection of atoms.
So R is simply the main body of the amino acid, minus the carboxyl group in the case of the picture?
Thank you both
And all amino acids have the same number of carboxyl/amine groups?
Search the internet or check out an introductory text and it will all become very clear. While all amino acids have one amino group and one carboxyl group, the R group of some amino acids may also contain -COOH or -NH2 so no not all amino acids have the same #
But according to the theory of chemical evolution amino acids appears first along with sugar, nitrogenous base, pigment and fats... as we know that nucleic acid comprises of nitrogenous base, phosphate group and pentose sugar therefore nucleic acid appears later
all amino acids do not have the same number of carboxyl/amine groups..
Just because amino acids were present first doesn't mean they incorporated into life as we know it. Also our theories on the origins of life are probably not correct - they're just the best guess we have. But a very interesting argument! Anyway it's breakfast time here in Canada, good luck prakharluv.
henpen i mean
Some amino acids have carboxyl/amino groups in their side chains, but they all have the same COOH-CH-NH2 structure at the base (well, except Proline, but it's a bit odd because of the ring structure, and you can look that up yourself).
~Amino acids and nucleotides are building blocks of two important macromolecules in biological systems. Both are organic molecules and present in high concentrations inside cells. ~Amino acids are the building blocks of proteins. When two amino acids join to form a dipeptide, the combination takes place in a -NH2 group of one amino acid with the –COOH group of another amino acid. A water molecule is removed, and the formed bond is known as a peptide bond. Thousands of amino acids can be condensed like these to form long peptides, which are then folded into make proteins. ~Nucleotide is the building block of two crucial macromolecules (nucleic acids) in living organisms called DNA and RNA. They are the genetic material of an organism and are responsible for passing genetic characteristics from generation to generation. Further, they are important to control and maintain cellular functions. Other than these two macromolecules, there are other important nucleotides ~A nucleotide is composed of three units. There is a pentose sugar molecule, a nitrogenous base and the phosphate group/s. According to the type of pentose sugar molecule, nitrogenous base and the number of phosphate groups, nucleotides differ.