In this article we will discuss about the six basic rules for DNA replication. The rules are: 1. Replication is a Semi-conservative Process 2. Replication has Direction 3. Replication Starts off a Unique Point on Bacterial and Viral Chromosomes 4. Replication of Both Strands Proceeds by the Addition of Nucleotide Monomers in the 5'-3' Direction and Others. Rule # 1. [...]
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 [...]
The morphologic characteristics of chromosomes are best studied during metaphase and anaphase of cell division. The chromosome was supposed to be covered by a membranous Pellicle. Electron microscope studies later showed that there is no definite membranous pellicle surrounding the chromosomes. A matrix of some sort, possibly protein, lipid, may be present. Other structures present in the chromosome include the [...]