The below mentioned article provides a note on the process of transcription. Transcription is the process of copying genetic information from one strand of the DNA into RNA. In transcription, only a segment of DNA or only one out of the two stands is copied into RNA. Unlike replication, which once set in, the total length of DNA of organisms [...]
In this article we will discuss about the process of transcription in prokaryotes and eukaryotes. Transcription in Prokaryotes: DNA dependent RNA polymerase is the single enzyme that catalyses the transcription of all types of bacterial RNA. (i) Initiation: RNA polymerase binds to promoter and initiates transcription. It associates transiently with 'initiation factor' (σ) and uses nucleoside triphosphates as substrate, obeying [...]
The following points highlight the three main classes of RNA molecules and RNA processing. The classes are: 1. Messenger RNA 2. Ribosomal-RNA 3. Transfer-RNA. Class # 1. Messenger RNA: Messenger RNA (m-RNA) is an informational molecule. The genetic message for protein synthesis contained in DNA is transcribed in the complementary ribonucleotide sequence of m-RNA. A group of three consecutive nucleotides [...]