Final answer:
The correct mRNA sequence transcribed from the DNA sequence TAG CAT GGC A is AUC GUA CCG U, reflecting the complementary nature of the nucleotide bases during transcription.
Step-by-step explanation:
The student's question pertains to the process of transcription where a DNA sequence is used to form a complementary mRNA sequence. In transcription, the DNA bases adenine (A), cytosine (C), guanine (G), and thymine (T) are paired with uracil (U), guanine, cytosine, and adenine on the mRNA, respectively. Considering the DNA sequence given TAG CAT GGC A, the corresponding mRNA sequence would be AUC GUA CCG U, where the adenines (A) are paired with uracils (U) and the other bases are paired as mentioned above.