Question

A mutation that changes the amino acid codon into a stop codon are called

a.) silent

b.) missense

c.) nonsense

d.) insertion

Answer 1

A codon consists of three nucleotides, which codes for a specific amino acid. When a nucleotide substitution results the codon into stop codon, which doesn't code for any other amino acid is called non-sense mutation.

Missense mutation, as a result of mutation the codon codes for different amino acid.

Silent mutation, after the replacement of a nitrogenous base it doesn't affect the sequence of amino acid. It codes for the same amino acid.

Insertion mutation is a addition of one or more nitrogenous base in a sequence.

So, the correct answer is c) nonsense mutation.