BIO 2306 Lecture Notes - Lecture 14: Phosphodiester Bond, Methyl Group, Intron
Document Summary
Chapter 14 rna molecules & rna processing (coding region) (non-coding region) Introns are rare in bacteria but common in eukaryotes. Introns are intervening sequences that typically do not encode proteins. The number of introns found in an organism"s genome is typically related to complexity more complex organisms possess more introns. Takes place in the nucleus before the rna moves to the cytoplasm: addition of 5" cap. Function: stabilizes mrna, enhances rna splicing (intron removal, aids in ribosome binding to 5" end of mrna. An extra nucleotide at the 5" end of mrna. Methyl groups (ch3) added on the base of the extra nucleotide (^) and on the 2" oh group of the sugar of one or more nucleotides at the 5" end. Shortly after transcription, one of the 3 phosphate groups is removed and a guanine nucleotide is added. It is attached via a unique 5" 5" bond (which is different from all of there.
