BIO 1140 Lecture Notes - Lecture 13: Eukaryote, Reverse Transcriptase, Microrna

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Achieved through operons; genetic switches that control transcription (on/off) Lacose for operons (lac z,y,a) for metabolism of lactose. Operons sets related mrnas that code for functionally related proteins. Lack of lactose, can have low levels of enzymes. Absence of lactose protein involved with lactose metabolism are not produced due to lac repressors bind to the operator. In addition to the tic; activators and repressors control which gene are expressed and the rate at which transcription occurs. Sirna can bind mrna and target degradation (no translation) Micro rnas (mirna) are important for regulation of gene expression. They form misisc (mirna reduced silencing complex this halts translation and. Dicer gets rid of the loop and then gets rid of one or 2 strands of the rna. Fishes for messenger rna that has not been found by a rhybozome. Lining up of the strand can be perfect tell messanger to be degraded.

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