Multiple choice

Which of the following statements regarding the noncoding DNA is false?

  1. The amount of noncoding DNA varies greatly among species.

  2. Acts as a genetic switch.

  3. Controls the flow of transcription.

  4. Prevents frameshift mutation.

  5. The noncoding regions are under poor evolutionary pressure and negative selection.
Reveal answer Fill a bubble to check yourself
E 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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