Gene regulation in known to be further regulated at the post-transcriptional level. This means that aside from the different mechanisms that prevent the unnecessary transcription of genes, the transcript of these genes also have additional mechanisms/modifications that prevent the synthesis of different unnecessary protein products. Being a post-transcription action, this would require the mRNA product to be processed further.
How can gene expression be regulated post-transcriptionally?
A. Chromatin packing controls which genes are accessible to transcription factors and RNA polymerase.
B. RNA polymerase needs to be phosphorylated to allow for elongation to begin.
C. microRNAs can trigger degradation of mRNAs, preventing their translation.
D. Alternative splicing causes different protein products from the same unprocessed mRNA.
E. The 5' untranslated regions can interact with different translation initiation factors.
F. The rate of mRNA destruction varies based on protein interactions with the 5' and 3' untranslated regions.
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