Question

given the sequence of dna nucleotide bases ttagccttg, give the complementary strand of mrna produced during transcription
a aaaaaaahh
b aagguagua
c aaucggaac
d aautgccta

Explanation:

To find the complementary mRNA strand from the DNA sequence (TTAGCCTTG), we use base - pairing rules. In transcription, DNA's T (thymine) pairs with mRNA's A (adenine), DNA's A (adenine) pairs with mRNA's U (uracil), DNA's G (guanine) pairs with mRNA's C (cytosine), and DNA's C (cytosine) pairs with mRNA's G (guanine).
Let's go through the DNA sequence TTAGCCTTG base by base:

• The first base in DNA is T, so the corresponding mRNA base is A.
• The second base in DNA is T, so the corresponding mRNA base is A.
• The third base in DNA is A, so the corresponding mRNA base is U.
• The fourth base in DNA is G, so the corresponding mRNA base is C.
• The fifth base in DNA is C, so the corresponding mRNA base is G.
• The sixth base in DNA is C, so the corresponding mRNA base is G.
• The seventh base in DNA is T, so the corresponding mRNA base is A.
• The eighth base in DNA is T, so the corresponding mRNA base is A.
• The ninth base in DNA is G, so the corresponding mRNA base is C.

Putting these together, we get the mRNA sequence AAUCGGAAC, which matches option C.

Answer:

C. AAUCGGAAC