In this article we will discuss about the properties of lac operon. Also learn about the role of cyclic AMP in lac operon. i) Products of all genes are transcribed in a single mRNA, called polygenic or polycistronic, starting from single promoter site. ii) mRNA of lac operon mol wt. 1.7 x 106 daltons is far greater than the need [...]
In this article we will discuss about the functional aspects and mechanisms of genetic code. Functional Aspects of Genetic Codon: All the amino acids except methionine and tryptophan are specified by more than one codon. Three amino acids—leucine, serine and orginine—are each specified by six different codons. Isoleucine has three codons, and the other amino acids each have either two [...]
In this article we will discuss about the mechanism of eukaryotic gene expression, particularly in humans. 1. In multicellular organism, each cell expresses a subset of its genes. 2. A cell expresses different genes depending on its growth state or environment. 3. Sometimes gene transcripts are spliced differently in different cells. 4. Each gene carries not only structural information but [...]