MCAT Question A Day - 5/8/14 - Answer!

An mRNA molecule being translated at the rough endoplasmic reticulum is typically shorter than the gene from which it was transcribed because:

A. the primary transcript was cut as it crossed the nuclear membrane.

B. normally mUltiple copies of the mRNA are produced and spliced.

C. introns in the primary. transcript are excised.

D. several expressed regions of the primary transcript have equal numbers of base pairs

C is correct. The introns (intervening sequences) are removed during post transcriptional modification.

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