To determine which DNA codons code for aspartic acid, we first need to identify the corresponding mRNA codons for aspartic acid. Aspartic acid is coded by the mRNA codons GAU and GAC.
Now, converting the mRNA codons back to DNA codons:
- The mRNA codons GAU and GAC correspond to the DNA codons CTA and CTG, respectively.
Now, we can identify the correct answers from your options:
A. CAG - does not code for aspartic acid.
B. CTA - codes for aspartic acid (complementary to GAU).
C. CTG - does not code for aspartic acid.
D. GAC - does not apply since it is an mRNA codon (but corresponds to CTA).
E. GAU - does not apply since it is an mRNA codon.
However, if we take GAC and GAU as DNA codons, they correspond to the aspartic acid in mRNA.
Thus, the correct DNA codons that code for aspartic acid are:
B. CTA
D. GAC
E. GAU (it’s technically an mRNA codon but included for clarity)
Given your multiple selection format, the primary answer would typically focus on option B. But if interpreting strictly as mRNA, the confirmed DNA codons for aspartic acid would be B (CTA) and it’s notable that D (GAC) & E (GAU) refer to the corresponding mRNA directly used for coding requirement.
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