Chapter 12, Problem 18P

Interpretation Introduction

Interpretation:

The affect of the replacement of tryptophan by cysteine to the $\text{mRNA}$ sequence and the number of nucleotides changes that are necessary in replacing $\text{Trp}$ with $\text{Cys}$ in this coding sequence are to be stated. Also, the total number of possible oligonucleotide sequences for $\text{mRNA}$ if $\text{Cys}$ replaces $\text{Trp}$ is to be calculated.

Concept introduction:

DNA stands for deoxyribonucleic acid, is a biological macromolecule. In organisms, it carries genetic information and is required for protein production, cell reproduction, regulation and metabolism.

There are four base types of DNA: adenine (A), cytosine (C), guanine (G) and thymine (T). The adenine is complementary nucleotide for thymine and cytosine is the complementary nucleotide for guanine.

Proteins are the biomolecules which are composed of the long chain of amino acid residues.