Eukaryotic mRNAs are synthesized in the nucleus, are called ____, and contain noncoding regions called ____ because they intervene between coding regions called ____.
A) poly A RNAs; noncodons; codons
B) poly A RNAs; intervening sequences; codons
C) heterogeneous nuclear RNAs; intervening sequences (introns); codons
D) heterogeneous nuclear RNAs; intervening sequences (introns); exons
E) none of the above.

Question

Quizplus · Accepted Answer

Eukaryotic mRNAs are initially synthesized in the nucleus as heterogeneous nuclear RNAs (hnRNAs), which contain noncoding regions known as intervening sequences or introns. These introns are located between the coding regions called exons.

Eukaryotic MRNAs Are Synthesized in the Nucleus, Are Called ____