Final answer:
The complementary mRNA sequence to the DNA code ATG is UAC, following base-pairing rules where Adenine pairs with Uracil, and Guanine pairs with Cytosine.
Step-by-step explanation:
If a DNA strand has the code ATG, the complementary sequence for the mRNA strand would be UAC.
Here's the reasoning with the bases:
- Adenine (A) pairs with Uracil (U) in RNA
- Thymine (T) pairs with Adenine (A) in DNA, which corresponds to Uracil (U) in RNA
- Guanine (G) pairs with Cytosine (C) in both DNA and RNA
Therefore, the complementary mRNA strand to the DNA sequence 5'-ATG-3' would be 5'-UAC-3'. Keep in mind that during transcription, the thymine in DNA is replaced with uracil in RNA.