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PCAT Biological Processes – mRNA Transcription From dsDNA
- by
- Apr 19, 2018
- PCAT Question of the Day
The mRNA transcribed from a dsDNA molecule has a partial sequence of 5′-AUGAAUC-3′. The corresponding sequence on the sense DNA strand is:
A. 3′-TACTTAG-5′.
B. 3′-UACUUAG-5′.
C. 5′-AUGAAUC-3′.
D. 5′-ATGAATC-3′.
Click for Explanation
D is correct. The sense (or coding) DNA strand should have the same sequence as the mRNA strand produced, except the DNA strand should contain thymine instead of uracil. Here, Choices B and C represent mRNA, not DNA, and Choice A is the sequence of the antisense (or template) DNA strand.
mRNA: 5′-AUGAAUC-3′
antisense DNA: 3′-TACTTAG-5′
sense DNA: 5′-ATGAATC-3′
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