The below mentioned article provides notes on DNA replication in prokaryotic and eukaryotic organisms. Notes # Meaning of DNA Replication: A double-stranded DNA molecule is capable of producing two identical molecules from nucleotide monomers with the help of some proteins. This is known as DNA replication. DNA needs replication, because every cell produced by division of a pre-existing cell must [...]
In this article we will discuss about selection of different types of mutants:- 1. Resistant Mutants 2. Regulation-Defective Mutants 3. Auxotrophic Mutants. 1. Resistant Mutants: From a wild-type bacterial population which is susceptible to agents like bacteriophage, various drugs, ultra-violet light etc., mutants which are resistant to any of these agents can be selected directly by using selective media. After [...]
The following points highlight the top six repair mechanisms of damaged DNA. The repair mechanisms are: 1. Photo Reactivation 2. Excision Repair 3. Re-Combinational Repair Mechanism 4. Repair of DNA by Homologous Recombination 5. SOS Repair of Damaged DNA 6. Mismatch Repair. Repair Mechanism # 1. Photo Reactivation: We know that exposure of UV-irradiated bacteria immediately afterwards to visible light [...]