Chromatin contain DNA and Histone Proteins while Nucleosome represent chromatin coiled around histone proteins so Chromatin Regulation can be small scale in form of gene or large scale in form of chromosome, DNA Helix come from Metaphase Chromosome that derived proteins scaffold from looped domains which lead to tight helical fiber to Nucleosomes to DNA Nucleotides, The direction of gene start from 5’ to 3’ and between these ends there are promoter as control gene region + Transcription start site + Untranslated regions + Exons + Introns + Terminator sequence, The typical Prokaryotic Promoter have Recognition sequence + TATA Box + RNA Polymerase attachment for transcription, The typical Eukaryotic Promoter have Recognition sequence + TATA Box + Transcription Factors + RNA Polymerase II attachment for transcriptions, Exons refer to genes that are actually transcribed into mRNA while Promoter allow RNA polymerase to bind to begin transcription whereas Repressor prevent polymerase from binding to go through transcription and other DNA sequences act to turn ON/OFF genes (Watch Related Video in #geneticteacher)
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