Question

determine the bases that will code for the amino acid methionine.
put the following in first, third, or second base.
uracil cytosine adenine guanine

Answer 1

Methionine is coded by the mRNA codon "AUG." In this codon, the bases play specific roles in their position:

- **First base**: Adenine (A)
- **Second base**: Uracil (U)
- **Third base**: Guanine (G)

So, specifically:
- **First base**: Adenine (A)
- **Second base**: Uracil (U)
- **Third base**: Guanine (G)

If you require the coding for methionine using uracil, cytosine, adenine, and guanine in the specific context of codons:

The codon "AUG" codes for methionine, where:
- **A** (first base) - Adenine
- **U** (second base) - Uracil
- **G** (third base) - Guanine

Thus:
- **First base**: A (Adenine)
- **Second base**: U (Uracil)
- **Third base**: G (Guanine)

Cytosine is not a part of the codon for methionine.