The enzymes that splice the introns out of the initial mRNA strands are (blank). 04:40 The Cellular Level of Organization The enzymes that splice the introns out of the initial mRNA strands are (blank). A) proteasomes B) messenger RNA molecules C) small nuclear ribonucleoproteins D) RNA polymerases Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+