Question

Proteins are the polymers of __________.
A. Formaldehydes
B. Secondary amines
C. Amino acids
D. Ammonia

Answer 1

Hint: We know that polymer is a large molecule or a macromolecule which essentially is a combination of many subunits. We need to find out the monomer which is linked to form a polymer of protein.

Complete step by step answer:
We need to find out the monomer of protein. A polymer is formed by joining a single molecule with the other same molecules is a monomer. Here, the monomer of protein is amino acids. Protein is formed by the joining of many monomer units of amino acids through peptide bonds. More clearly, peptide bonds join the carboxyl group of amino acid with the amino group of another amino acid.
So, proteins are the polymers of amino acids.

Therefore, the correct option is (c).

Additional Information:
HCHO is the formula of naturally occurring polymer formaldehyde. The pure formaldehyde is a colourless gas which polymerises easily.
Amino acids are of two types, they are essential and non-essential. Essential amino acids should be given to our body through diet.

Note: The type of linkage of monomer is important. Here, monomers are linked through polypeptide linkage to form proteins. Don’t be confused with peptide linkage and glycosidic linkage. Hemiacetal group of saccharides and hydroxyl group of alcohols participate in glycosidic linkage. A substance containing a glycosidic bond is called a glycoside.