The DNA sequence CCAAGAAGTCGACAAACA is translated to synthesise the amino acid chain gly-ser-ser-ala-val-cys.
As a result of a mutation, the sequence length of the amino acid chain is shortened from six to two amino acids. A stop codon in mRNA is UGA.
Which base in the DNA sequence was changed by the mutation?
1 )
A
2 )
C
G
4 )
T
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