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13 Dec 2019

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In the systematic nomenclature of peptides

nonpolar amino acids are listed last.

the N-terminal amino acid residue is given first.

the order of the amino acids is not important.

the amino acids are listed along with their D or L configurations.

the C-terminal amino acid is given first.

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Keith LeannonLv2

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Proteins are naturally occurring polymers formed by condensation reactions of amino acids, which have the general structure

In this structure, –R represents –H, –CH₃, or another group of atoms; there are 20 different natural amino acids, and each has one of 20 different R groups. (a) Draw the general structure of a protein formed by condensation polymerization of the generic amino acid shown here. (b) When only a few amino acids react to make a chain, the product is called a “peptide” rather than a protein; only when there are 50 amino acids or more in the chain would the molecule be called a protein. For three amino acids (distinguished by having three different R groups, R1, R2, and R3), draw the peptide that results from their condensation reactions. (c) The order in which the R groups exist in a peptide or protein has a huge influence on its biological activity. To distinguish different peptides and proteins, chemists call the first amino acid the one at the “N terminus” and the last one the one at the “C terminus.” From your drawing in part (b) you should be able to figure out what “N terminus” and “C terminus” mean. How many different peptides can be made from your three different amino acids?

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b) SELECT TWO

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		nonpolar amino acids are listed last.
		the N-terminal amino acid residue is given first.
		the order of the amino acids is not important.
		the amino acids are listed along with their D or L configurations.
		the C-terminal amino acid is given first.