Question

Which of the following is not true about noncoding DNA sequences?

Choose one: A. They contain regulatory elements that ultimately dictate each organism’s development. B. They are essentially the same in humans, chimps, and mice. C. Their sequences have been shaped by evolution. D. Changes in these sequences are likely to be involved in giving rise to new species.

Answer 1

The following is not true about non coding DNA sequences:

D. Changes in these sequences are likely to be involved in giving rise to new species.

EXPLANATION:

• many regions of non coding DNA contains regulatory elements. It can also determine the on and off mechanism of various genes.
• Due to alteration in these sequences, a mutation in noncoding DNA can cause a protein to be expressed wrongly, which can give rise to many mutations.
• for example, developmental disorders such as isolated Pierre Robin sequence have been linked to the non coding sequences of DNA.

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