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Introns are nucleotide sequences that are spliced out of mature RNA. Some genes have lost introns during evolutionary processes.

Which of the following statements are TRUE regarding introns?

Select ALL that apply.

A

Intron length is directly correlated with transcript levels.

B

Genes that must change expression levels rapidly have fewer introns.

C

Transcription proceeds at 1200-1500 per minute and thus intron length would slow transcription down.

D

A greater number of introns would increase splicing time.

E

One method of losing introns is reverse transcription of RNA to DNA during the formation of a pseudogene.

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