During mRNA transcription, a DNA strand has the bases CTAGGT. What is the complementary strand of mRNA?
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a
TCGAAC
b
GATCCA
c
AGCTTG
d
GAUCCA
During mRNA transcription, the complementary RNA bases pair up with the DNA bases according to the rules of base pairing: adenine (A) pairs with uracil (U) in RNA (instead of thymine, T, as it would in DNA), and cytosine (C) pairs with guanine (G). Given the DNA strand with the bases CTAGGT, we can find the complementary mRNA strand by replacing each DNA base with its corresponding RNA partner.
DNA: C T A G G T
mRNA: G A U C C A
Therefore, the correct complementary strand of mRNA to the DNA sequence CTAGGT is GAUCCA, which is option d.