It Has Been Recently Determined That the Gene for Duchenne

question 6

Multiple Choice

It has been recently determined that the gene for Duchenne muscular dystrophy DMD is more than 2000 kb kilobases in length; however,the mRNA produced by this gene is only about 14 kb long.What is a likely cause of this discrepancy?

• A)The exons have been spliced out during mRNA processing.
• B)There are more amino acids coded for by the DNA than by the mRNA.
• C)The DNA represents a double- stranded structure,whereas the RNA is single- stranded.
• D)The introns have been spliced out during mRNA processing.
• E)When the mRNA is produced,it is highly folded and therefore less long.

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