In this article we will discuss about the function of regulator gene. The genetic basis for induction and repression was studied for several years by Jacob and Monod at the Pasteur Institute in Paris. They investigated regulation of the activities of genes which control fermentation of lactose through synthesis of the enzyme β-galactosidase in E. coli. They were awarded Nobel [...]
In his article we will discuss about the role of nucleolus in production of ribosomes (explained with diagram). The nucleolus is the site for rRNA transcription and processing as well as for assembly of ribosomal subunits. The nucleolus is organised at the nucleolus organising regions (NORs) of some chromosomes. These chromosomal regions contain the genes for 5.8S, 18S and 28S [...]
In this article we will discuss about the five main DNA repair mechanisms that are studied in eukaryotes. The mechanisms are: 1. Photo-Reactivation or Photo-Repair 2. Dark or Excision Repair 3. Nucleotide Excision Repair 4. Mismatch Repair 5. Post-Replication Repair. Mechanism # 1. Photo-Reactivation or Photo-Repair: This mechanism was discovered when bacteria that had been heavily irradiated with UV rays [...]