In mRNA, there isn't a Thymine nitrogen base. There is a "new" nitrogen base called Uracil, which takes its place. So in transcription, A=U and C=G.
What is mRNA function and structure?
Messenger RNA (mRNA) is a single-stranded RNA molecule that is complementary to one of the DNA strands of a gene. The mRNA is an RNA version of the gene that leaves the cell nucleus and moves to the cytoplasm where proteins are made.
Thus, option "C" is correct.
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