BIOL 1000 Lecture Notes - Lecture 39: Nuclear Pore, Sigma Factor, Peptide
13 May 2017
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Dna complex and transcription can begin o 2) Separated dna strands go back together: 3) termination rna polymerase reaches a sequence of bases in dna called terminator. Signals end of the gene: polymerase molecule detaches from rna molecule are gene, transcription also makes 2 other kinds of rna that are involved in building polypeptides, messenger rna, transfer rna, ribosomal rna. 10. 10 eukaryotic rna is processed before leaving the nucleus as mrna: messenger rna (mrna) = rna that encodes amino acid sequences. Conveys genetic messages from dna to translation machinery of the cell. Transcribed from dna, information in mrna is transcribed into polypeptides . In prokaryotic cells, translation and transcription occur in cytoplasm . In eukaryotic cells, mrna molecule exits the nucleus via nuclear pores, and enters the cytoplasm . Eukaryotic transcripts are modified before leaving the nucleus are mrna . E. g. addition of extra nucleotides to ends of rna transcript (small cap at one end, long tail at other end)
