Types of RNA Pt. 2
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Last updated 12:33 AM on 10/8/25
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4 Terms
1
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What is pre-rRNA?
is the precursor to mature 18S, 5.8S, and 28S ribosomal RNAs. It is processed by cleavage, trimming, and base modification.
2
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What is snoRNA?
base-pair with complementary regions of pre-rRNA to guide cleavage and modification during rRNA maturation.
3
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What is siRNA?
are about 22 bases long and perfectly complementary to a sequence in an mRNA. They trigger cleavage and rapid degradation of the target mRNA.
4
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What is miRNA?
are about 22 bases long and base-pair imperfectly with mRNAs, especially through a “seed sequence.” They inhibit translation and promote mRNA degradation.
Note 
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