A dipeptide molecule (leucine-alanine) shown in 3-D
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A dipeptide is formed when two amino acids (in this case leucine and alanine) combine together. The -CONH- bond between the amino acid residues is called a peptide bond.
If the condensation process is repeated with one more amino-acid it will make a tripeptide, or if many amino-acids are combined the result is a polypeptide.
In each of these cases, there is an unattached amino group (-NH2) at one end as well as an unattached acid group (-COOH) at the other end of the chain of amino acid residues. These are called the N-terminus and the C-terminus.
Other options: Label the peptide bond atoms.
Highlight leucine residue
Highlight alanine residue
You can move this molecule in 3 dimensions by holding down the left button and dragging using the mouse.
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Right clicking gives a variety of display options.
Simply leaving the mouse pointer over one of the atoms will give information about it; the atom symbol, and some other less useful numerical information.