2. RNA Processing

Eukaryotic mRNAs Are Capped at the 5′ End

Both Introns and Exons Are Transcribed from DNA into RNA

RNA Catalyzes the Splicing of Introns

In Eukaryotes the Spliceosome Carries out Nuclear pre-mRNA Splicing

Proteins Catalyze Splicing of tRNAs

Eukaryotic mRNAs Have a Distinctive 3′ End Structure

A Gene Can Give Rise to Multiple Products by Differential RNA Processing

BOX 26-2 Alternative Splicing and Spinal Muscular Atrophy

Ribosomal RNAs and tRNAs Also Undergo Processing

Special-Function RNAs Undergo Several Types of Processing

Cellular mRNAs Are Degraded at Different Rates