6. How can a gene be longer than an mRNA produced by that gene? For instance, th

Question

6. How can a gene be longer than an mRNA produced by that gene? For instance, the gene for Duchenne muscular dystrophy (DMD) is over 2000 kb (kb = kilobases) long, but the mRNA that this gene produces and that is found in polyribosomes is approximately 14 kb long. What causes this discrepancy?

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

-- A particular triplet of bases in the template sequence of DNA is 5'–TCA–3'. The anticodon component of the tRNA that binds the mRNA codon from this DNA is which of the following? Note: By convention, the 3' end of each anticodon is written on the left, 5' on the right.

A. AGT
B. ACU
C. ACT
D. UGA
E. either UGA or ACT, depending on wobble in the first base

Explanation / Answer

Answer: 1) [D] Introns are sections that are removed after you process mRNA. Exons are left as it is and combined after introns are removed. 2) [A] T is complementary to A C is complementary to G The strands are always anti-parallel such that a 5' end always matches up to a 3' end.

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