Question

question 30
a mutation that changes a normal codon to a stop codon is called a ______ mutation.
a silent
b point
c back
d missense
e nonsense

Explanation:

A nonsense mutation specifically changes a normal codon (coding for an amino acid) to a stop codon, prematurely terminating protein synthesis. Silent mutations do not change the amino acid; point mutations are a broad category (including nonsense); back mutations reverse previous mutations; missense mutations change to a different amino acid codon.

Answer:

E. nonsense