The complementary mRNA sequence for a DNA strand with the code ATG is UAC.
Here’s the explanation:
In DNA, the bases are Adenine (A), Thymine (T), Cytosine (C), and Guanine (G). During transcription, DNA is converted into mRNA. In mRNA, Thymine (T) is replaced by Uracil (U). The complementary base pairing rules are:
- Adenine (A) pairs with Uracil (U) in mRNA.
- Thymine (T) pairs with Adenine (A) in mRNA.
- Cytosine (C) pairs with Guanine (G) in mRNA.
- Guanine (G) pairs with Cytosine (C) in mRNA.
So, for the DNA sequence ATG:
- A pairs with U.
- T pairs with A.
- G pairs with C.
Therefore, the complementary mRNA sequence is UAC.