Question

23 if the dna sequence is tcc - cga, what is the complementary mrna nucleotide sequence? a agg - cgt b tag - gct c agg - gcu d tau - uat

Explanation:

• In transcription, DNA to mRNA base - pairing rules are: A (adenine in DNA) pairs with U (uracil in mRNA), T (thymine in DNA) pairs with A (adenine in mRNA), C (cytosine in DNA) pairs with G (guanine in mRNA), and G (guanine in DNA) pairs with C (cytosine in mRNA).
• For the DNA sequence TCC - CGA:
• T (first base of TCC) pairs with A, C (second base of TCC) pairs with G, C (third base of TCC) pairs with G. So TCC in DNA gives AGG in mRNA.
• C (first base of CGA) pairs with G, G (second base of CGA) pairs with C, A (third base of CGA) pairs with U. So CGA in DNA gives GCU in mRNA.

Answer:

C. AGG - GCU