Question

1. How many different DNA sequences can be generated from a DNA sequence composed of 15 nucleotides (A, T, C or G)?

2. How many different “biological information” can be produced from a protein sequence consisting of 15 amino acids?

Answer 1

Answer 1

As we know, DNA is composed of 4 nucleotides (A, T, C or G). If we have total 15 nucleotides then these 15 nucleotides combine to form a DNA sequence of 15 nucleotide length.

Number of different DNA sequence generated from a DNA sequence composed of 15 nuceotides are : 4ⁿ (where n is number of nucleotides present).

Here n is 15, So, 4¹⁵ DNA sequences can be generated.

Answer 2

As we know, total 20 types of amino acids are present in a protein sequence. If we have total 15 amino acids then 15 amino acids combine to form different possible polypeptide chains. According to the formula, number of different polypeptide generated from a protein sequence composed of 15 amino acids are:

20ⁿ = 20 ¹⁵ (where n = 15).

So, total 20 ¹⁵ polypeptide can be generated from 15 amino acids of 15 amino acid length.