While a eukaryotic pre-mRNA is still being synthesized it is modified on its 5' end when

a. exon shuffling mixes mRNA pieces.
b. enzymes recognize a polyadenylation signal in the trailing RNA sequence.
c. the RNA introns are cut out by the spliceosome.
d. an enzyme adds a guanine-containing cap.
e. the RNA exons are spliced together.


D

Biology & Microbiology

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Bacteria use restriction enzymes to ____.

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The slowest but most effective control for acid-base balance is the.

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