Multiple choice

Which of the following statements does not characterise the noncoding DNA in the cell?

  1. The noncoding regions are under poor evolutionary pressure and negative selection.

  2. Prevents frameshift mutation.

  3. Controls the flow of transcription.

  4. Acts as genetic switches.

  5. The amount of noncoding DNA varies greatly among species.
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A Correct answer
Explanation

Many noncoding DNA sequences have important biological functions as indicated by comparative genomics studies that report some regions of noncoding DNA that are highly conserved, sometimes on time-scales representing hundreds of millions of years, implying that these noncoding regions are under strong evolutionary pressure and positive selection.

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