Proteins can be used:

Amino acids can be classified as $\alpha$,$\beta$,$\gamma$,$\delta$ and so on,depending upon the relative positions of the amino group with respect to the carboxyl group. Which type of amino acids form polypeptide chains in proteins?

In a linear tetrapeptide (constituted with different amino acids),the value of (number of amino acids) - (number of peptide bonds) is:

What is the secondary structure of proteins composed of?

$A$ polypeptide can be called a protein when its mass is

The cell membrane is primarily composed of ...........