Biology 1002B Lecture Notes - Lecture 15: Polyadenylation, Lac Operon, Nuclear Pore
24 Aug 2013
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Document Summary
The synthesis and function of a typical trna molecule requires complementary base-pairing with itself, Dna, other rna and one particular amino acid. The lac operon probably has nothing to do with the molecule lactose. Even though galactosidease concentration increases, lactose simply induces and is not the primary galactoside responsible for the intended function of this operon. This is easy to explain as it is highly unlikely that e. coli would ever encounter lactose in its environment, the gut of adult mammals, which seldom in evolutionary history ever consumed milk. Other evidence shows that the lac a gene, which codes for transacetylase, does not transfer a single acetyl group to lactose. This doubts that lactose is at all responsible for the lac operon"s existence in: coli, but rather that another galactoside that may need acetylation from time to time, could be responsible. The answer lies with the regulation of eukaryotic genes.
