AP Biologymediummcq1 pt
A segment of the DNA template strand reads 3'-TACGCT-5'. Which mRNA sequence results when this segment is transcribed?
A.5'-AUGCGA-3'
B.5'-ATGCGA-3'
C.5'-TACGCT-3'
D.5'-AGCGUA-3'
Explanation
Core Concept
RNA polymerase reads the template strand 3' to 5' and builds the RNA antiparallel in the 5' to 3' direction. Each template base directs its complement, with uracil substituting for thymine: T pairs with A, A pairs with U, C pairs with G, and G pairs with C. Applying these rules to 3'-TACGCT-5' yields 5'-AUGCGA-3'.
Correct Answer
A5'-AUGCGA-3'
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