E. coli RNA Polymerase

Sequences of E. coli Promoters

Transcription by E. coli RNA Polymerase

Transcription by E. coli RNA Polymerase

Transcription by E. coli RNA Polymerase

Classes of Genes Transcribed by Eukaryotic RNA Polymerases

Processing of Ribosomal RNAs

Ribosome Structure

and mitochondria

Ribosome Assembly

Structure of tRNAs

Processing of Transfer RNAs

Attachment of Amino Acids to tRNAs

tRNAs are activated by amino-acyl tRNA synthetases

A Eukaryotic Promoter

Formation of a Polymerase II Transcription Complex

Formation of a Polymerase II Transcription Complex

RNA Polymerase II/Mediator Complexes

RNA Polymerase II/Mediator Complexes

DNA Looping

Processing of Eukaryotic Messenger RNAs

Processing of Eukaryotic Messenger RNAs - capping

Processing of Eukaryotic Messenger RNAs – capping and splicing

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Eukaryotic genes: mosaic of introns & exons

Exons (expressed sequences)

Introns (intervening sequences)

Splicing

Splicing alternativo

Splicing alternativo