BIO 1140 Lecture Notes - Lecture 15: Microrna, Lac Repressor, Complementary Dna
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When e. coli are grown in the absence of lactose, proteins involved with lactose metabolism are not produced because ________ Slide 6 question in eukaryotes, difference in gene expression between various cell types in one individual are best explained by ______ Promoter proximal elements recognized by activators found only in specific cell types; activators are proteins. In addition to the tic; activators and repressors control which genes are expressed and the rate at which transcription occurs. Activators are proteins that are present in our cells because they are proteins that have been transcribed and translated and you have different available amounts. The same way transcription factor binds to the promoter and activates transcription. All of them will not be transcribed in all cell types, and you will have different combinations of these activators that can happen inside the cell; will help modulate when and which genes are activated.