A transcription of DNA consists of 3 parts ;
a promoter , structural gene and a terminator .
The enzyme that polymerize the RNA chain is DNA dependent RNA polymerase .
The DNA strand that has polarity 3' to 5' acts as a template .
The other strand which do not code for anything is called coding strand .
The sigma factor initiates transcription of the RNA chain .
The RNA chain grows from 5' to 3' end .
The RNA chain is terminated by a protein called rho factor .
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