Proteins have primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?

Aminoacids, as the name suggests, have both an amino group and a carboxyl group in their structure. In addition, all naturally occurring aminoacids (those which are found in proteins) are called L-aminoacids.From this, can you guess from which compound can the simplest aminoacid be made?

What do you mean by the secondary structure of proteins?

Can you describe What happens when milk is converted into curd or yoghurt, from your understanding of proteins?