Question

an mrna has the sequence 5-uacggucuaagcuga-3. what is the sequence of the coding dna strand?
5-agtcgaatctggcat-3
5-tcagcttagaccgta-3
5-atgccagattcgact-3
5-atcggacattgcagt-3
5-tacggtctaagctga-3

Explanation:

Step1: Recall base - pairing rules

In DNA and RNA, A pairs with U (in RNA) or T (in DNA), and G pairs with C. The coding DNA strand has the same sequence as the mRNA except that T replaces U.

Step2: Identify the mRNA sequence

The mRNA sequence is 5'-UACGGUCUAAGCUGA-3'.

Step3: Replace U with T

Replace each U in the mRNA sequence with T. The resulting sequence of the coding DNA strand is 5'-TACGGTCTAAGCTGA-3'.

Answer:

5'-TACGGTCTAAGCTGA-3'