In a eukaryotic cell, a molecule of pre-mRNA is found to have four exons and three introns. Which of the following are possible combinations of the exons, if the order in which they are written is the order in which they will be translated?

I. Exon 1, Exon 2, Exon 3, Exon 4

II. Exon 1, Exon 3, Exon 4

III. Exon 4, Exon 1, Exon 2, Exon 3

The primary transcript is much longer than the mRNA that will eventually be translated. This can be explained by which of the following?

In eukaryotes, which of the following is true about introns and exons?

__________ are parts of __________ molecules that do not contain information about a protein's primary structure.

In most cases, introns are spliced out of mature messenger RNA (mRNA) and are not a part of the final translated protein product of a gene. Even though they are not included in the final protein, why are introns important?

If a gene produces a pre-RNA that is 1200 basepairs long and has the following intron-exon structure:

Exon 1 - 200 bp

Intron 1 - 100 bp

Exon 2 - 50 bp

Intron 2 - 150 bp

Exon 3 - 700 bp

How many basepairs long would we expect the mRNA to be?