A small section of a gene for a protein has the following nucleotide sequence:
CTG GGA TCC TAA GGT
Which of the following mutations would cause a nonsense mutation in the sequence shown above?
Select one:
a. Insertion of guanine base after the first adenine base
b. Replacement of second adenine base with a cytosine base
c. Insertion of guanine base after the first thymine base
d. Replacement of second cytosine base with a adenine base
20.A small section of a gene for a protein has the following nucleotide sequence:
GGC TCG GTA ACA TAC
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 guanine base with cytosine 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 thymine base with cytosine base
c. Replacement of second thymine base with adenine base
d. Replacement of first guanine base with cytosine base
22.A small section of bacterial DNA template (anti-sense) strand has the following nucleotide sequence:
CGA AAA GAG AAT
A mutation in the above sequence involved a substitution of a single base, resulting in an incomplete protein.
Which of the following gene sequences exemplifies the mutation described above?
Select one:
a. CGA AAA GAG ACT
b. UGA AAA GAG AAT
c. CGA UAA GAG AAT
d. CGA AAA AAG AAT
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