#19.A small section of a gene for a protein has the following nucleotide sequence:
GCT AGC AAC CGC GGG
Which of the following mutations would cause a nonsense mutation in the sequence shown above?
Select one:
a. Insertion of uracil base after the first thymine base
b. Insertion of uracil base after the second cytosine base
c. Replacement of second adenine base with a thymine base
d. Replacement of second guanine base with a thymine base
#20.A small section of a gene for a protein has the following nucleotide sequence:
CTA TCC CCT ACG TCA
Which of the following mutations would cause a silent mutation in the sequence shown above?
Select one:
a. Replacement of second adenine base with thymine base
b. Replacement of second thymine base with guanine base
c. Replacement of first thymine base with adenine base
d. Replacement of first cytosine base with guanine base
#21.A small section of a gene for a protein has the following nucleotide sequence:
CCT AAG GAT TCA CTT
Which of the following mutations would cause a missense mutation in the sequence shown above?
Select one:
a. Replacement of second guanine base with adenine base
b. Replacement of first guanine base with cytosine base
c. Replacement of first thymine base with cytosine base
d. Replacement of second thymine base with adenine base
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