Draw a schematic representation of the structure of a transcription unit and show the following in it:
(a) Direction in which the transcription occurs
(b) polarity of the two strands involved
(c ) template strand
(d) terminator gene
Please find below the solution to the asked query
There is no terminator gene. The nucleotides sequences terminate the process.
A transcription unit is a stretch of DNA that is to be transcribed into RNA molecule. A transcription unit encloses at least one gene. If the gene encodes protein, then after transcription the unit results in mRNA that in turn becomes protein after translation. The process of synthesising proteins from the DNA template is known as protein synthesis; where, the process of conversion of DNA into RNA is known as transcription.
Transcriptional Unit- A transcriptional unit has primarily three regions:
Promoter – Marks the beginning of transcription; RNA polymerase binds here. Generally transcription site is 'A' (Adenine) and it is denoted as +1. The transcription factors along with RNA polymerase bind 25-30 bases upstream of the start site (in the promoter region).
Structural gene – Part of the DNA that is actually transcribed
Terminator – Marks the end of transcription (the sequence is different for different RNAs)
You will learn in more details in your higher classes.
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