Nucleic Acids and the Genetic Material Problem Set 1
Problem 15: DNA template for mRNA synthesis
Summary of DNA transcription
The diagram depicts DNA transcription. The coding strand of DNA in blue is used as a template for the mRNA shown in green. Complementary base pairing is used to determine the base sequence. A key feature is that the sequence and polarity of the mRNA is the same as the noncoding strand of DNA shown in red. Thus, since both the non-coding strand and the mRNA are transcribed from the same coding strand, their sequences are the same, except that U replaces T. In question 15, the correct answer has to be DNA strand #2. Strand #1 is noncoding since it has the same A, G, and C composition and has its T percentage equal to U of mRNA.
University of Arizona
Sunday, September 29, 1996