IN a theory put forward in these columns in March last 1, it was suggested that the molecule of simple native protein may contain closed polypeptides: that the polypeptides, open or closed ...

The chemistry of amino acid side chains is critical to protein structure because ... side chains can form ionic bonds, and polar amino acids are capable of forming hydrogen bonds.

Uracil forms hydrogen bonds with adenine in RNA, contributing to the molecule's structure and function. (Image ... Uracil is part of several codons that specify different amino acids, the building ...