Question

How many unique sequences of amino acids 15 peptides long can you make using only:

1. Hydrophobic amino acids with a benzine ring

2. Hydrophylic acidic amino acids

Answer 1

Ans-1.

There are three hydrophobic amino acids having benzene ring in their structures are Phenylalanine, Tyrosine and Tryptophan.

The number of unique sequences of amino acids 15 peptides long

= (No. of different amino acid) ^{(No. of amino acids in a peptide)}

= 3¹⁵

Ans-2.

Among all amino acids, there are two acidic amino acids i.e. Aspartic acid and Glutamic acid which are the hydrophilic in nature.

Thus, The number of unique sequences of amino acids 15 peptides long

= (No. of different amino acid) ^{(No. of amino acids in a peptide)}

= 2¹⁵