Question

"The sequence of bases on one strand of a DNA molecule is AGCCTAG. After transcription of this strand of DNA, what is the sequence of nitrogen bases on the complementary strand?

A. UCGGAUC

B. TCGGATC

C. AGCCUAG

D. CTAGGCA"

Answer 1

In transcription, the DNA sequence AGCCTAG is transcribed into the mRNA sequence UCGGAUC, in which A pairs with U and C pairs with G.

Step-by-step explanation:

The question deals with the process of transcription, where the sequence of bases in a strand of DNA is used to make a complementary strand of mRNA. In transcription, adenine (A) pairs with uracil (U), and cytosine (C) pairs with guanine (G). So, given the DNA sequence AGCCTAG, the complementary mRNA sequence would be UCGGAUC (Option A).

To further elaborate, during transcription, thymine (T) in DNA is replaced by uracil (U) in mRNA. Therefore, the original DNA sequence corresponds to the mRNA sequence as follows: A pairs with U, G pairs with C, C pairs with G, C pairs with G, T pairs with A, A pairs with U, and G pairs with C, resulting in the mRNA sequence UCGGAUC.