You’re working in Marshall Nirenberg’s lab, trying to decipher the genetic code. You use several different synthetic repeating mRNAs in translation reactions and analyze the sequences of the...

You’re working in Marshall Nirenberg’s lab, trying to decipher the genetic code. You use several different synthetic repeating mRNAs in translation reactions and analyze the sequences of the polypeptides produced from each reaction. The results are summarized below.

mRNA sequence used: ...CACACACACACACAC... Polypeptide produced: ...His-Thr-His-Thr-His-Thr ...
mRNA sequence used: ...CCACCACCACCACCA...
Polypeptide produced: ...Thr-Thr-Thr... and ...Pro-Pro-Pro... and ...His-His-His...
mRNA sequence used: ...ACAACAACAACAACA...
Polypeptide produced: ...Thr-Thr-Thr... and ...Asn-Asn-Asn... and ...Gln-Gln-Gln...

Based on these results, write what amino acid each codon below corresponds to. If there is not enough information to narrow down to one amino acid, write all the possibilities.


CAC: ___________________________ ACC: ___________________________

ACA: ___________________________ CAA: ___________________________

CCA: ___________________________ AAC: ___________________________