transcription

general idea of transcription

dna transfered into rna

step 1

rna polymerase binds to a promoter region of dna and unwinds 20-30 nucleotides of dna

step 2

rna polymerase adds rna nucleotides that complement the unwound strand of dna

step 3

rna ploymerase reads the terminator sequence and stops transcription

step 4

rna is released from dna and the dna rewinds into a double helix

eukaryotic modifications of transcription

transcription factors

ends of rna

rna splicing

before rna polymerase unwinds dna

transcription factor protiens binds to dna to regulate transcription speed

before the recoding of dna

pre mrna gets added to the ends of the nucleotides

splicing

introns get cut out by the splicesome so the exons can be read