6. Methionine is coded for by
A. one codon only.
B. two different codons.
C. three different codons.
D. four different codons.
E. six different codons.
7. A missense mutation is one that
A. creates a stop codon in the mRNA.
B. changes the codon of one amino acid to that of another.
C. changes the reading frame of the mRNA.
D. creates a break in the DNA strand.
E. has no effect on the amino acid sequence.
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