the amino acid serine is coded by the mrna codon agu. what is the base sequence of the dna gene that originally produced this mrna condon?
a. tcc
b. tca
c. agu
d. uca
The correct answer is b. tca.
The base sequence of the DNA gene that originally produced this mRNA codon can be determined by replacing "u" (uracil) in the mRNA codon with "t" (thymine) in the DNA. Therefore, the base sequence of the DNA gene is "tca".