Assertion : A protein is a heteropolymer.
Reason : Dietary proteins are the source of non-essential amino acids.

Answer

C

Explanation

Each protein is a polymer of amino acids. As there are 20 types of amino acid, a protein is a heteropolymer and not a homopolymer. Amino acids can be essential or non-essential. Certain amino acids are essential for our health and they have to be supplied through our diet. Hence, dietary proteins are the source of essential amino acids. Non-essential amino acids are those amino acids which are synthesised in our body.