The edible portions of the leek are the white base of the leaves (above the roots and stem base), the light green parts, and to a lesser extent the dark green parts of the leaves. One of the most popular uses is for adding flavor to stock.
HOME BIOLOGY DEFINITION. Peptide bond. A peptide bond is a chemical bond formed between two molecules when the carboxyl group of one molecule reacts with the amino group of the other molecule, releasing a molecule of water (H 2 O). This is a dehydration synthesis reaction, and usually occurs between amino acids.
Peptides are polymers of amino acids. A tripeptide contains three amino acid residues. Peptide bonds are ester linkages. Peptide bonds form from nucleophilic attack by an alpha-carboxyl carbon atom on an electron pair of an alpha-amino nitrogen atom of another amino acid.