These are DNA sequences that preceede a transcription unit that need to have specific proteins present for RNA polymerase to begin transcription.
The proteins that mediate RNA Polymerase are known as "
Control of transcription factor availability is one of the major ways that cells of a multicellular organism accomplish "
differential gene expression
", which in turn allows cells to "
" to serve different functions in the organism.
This is crucial!!!
So many options lead to so many outcomes.
are necessary for eukaryotic mRNA to remain functional and be transported to the cytoplasm for translation.
" of exons allows for multiple functional (or non-functional) gene products to be made from a single primary transcript.
Anywhere from 75 - 100 percent of human genes with multiple exons probably undergo alternative splicing.
How is gene expression controlled?
Explain the structure and function of all expression control systems described in this presentation.
Compare and contrast the expression control systems utilized in prokaryotic and eukaryotic cells.
Relate prokaryotic expression control systems to prokaryotic cellular organization and feedback mechanisms.
Relate eukaryotic expression control systems to eukaryotic cellular organization and the decoupling of transcription and translation.
May be associated with common functions
Thousands of transcription factories in any nucleus
All the actors need to be present for the play to begin.
Eukaryotic genes interact with many "upstream" regulatory elements.