In this article we will discuss about the mechanism for the replication of DNA. The mechanism for the synthesis of DNA proposed by Watson and Crick offered the important advantage of explaining how new DNA molecules could be exact replicates of the old. According to Watson and Crick, each single strand is a template on mold for its complement, and [...]
In this article we will discuss about:- 1. Definition of Operon 2. Features of Operon 3. Effector Control of Messenger Synthesis 4. Polarity 5. Modulation. Definition of Operon: In 1961 two Nobel laureates, Jacob and Monod, postulated the existence of new genetic unit, the operon to explain the integrated control of the action of genes in a biosynthetic pathway in [...]
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 [...]