Which of the following statements describes a nonsense mutation?
o
a. a single base in either dna or mrna is replaced with the wrong
base but codes for the same amino acid.
o
b. a single base in either dna or mrna is replaced with the wrong
base, producing a stop codon.
o
c. a single codon is replaced with a different codon, causing the
wrong amino acid to attach to the chain.
o
d. a single base in either dna or mrna is deleted or inserted,
causing protein synthesis to stop early.

D

Explanation:

Premature termination of the translation results in an altered protein especially depending on where the point nonsense mutation occurs. The higher up the mutation the more lethal the mutation because an incomplete protein causes it to lose functionality.  There are 3 stop codons; UAA, UGA UAG and normally occur after the complete translation of a full polypeptide that can fold into a functional protein.

bc blah

explanation:

bc blah

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.