In this article we will discuss about:- 1. Meaning of Transcription 2. Mechanism of Transcription 3. Transcription in Eukaryotes. Meaning of Transcription: Transcription is the process by which a complementary RNA strand is synthesised from a specific region of DNA. The three different types of RNA are transcribed from different regions of DNA. The genes that transcribe mRNA are called [...]
In this article we will discuss about the structure of RNA. RNA is a long un-branched polynucleotide chain chemically similar to DNA except for two major differences. The sugar in DNA is a deoxyribose, in RNA a ribose. Out of the 4 nucleotides, three (G, C and A) are identical in DNA and RNA. The fourth is thymine in DNA, [...]
In this article we will discuss about the role of RNA polymerase in transcription. RNA polymerase enzymes are complex enzyme which in E. coli is made up of 5 subunits or polypeptide chains designated β, β', α, σ and ω with respective molecular weights of 160,000, 150,000, 90,000, 40,000 and 10,000. The α chain is present twice, others only once. [...]