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प्रश्न
Define a cistron. Giving examples differentiate between monocistronic and polycistronic transcription unit.
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उत्तर
Portion of DNA having information for an entire polypeptide or trait is called cistron. However, by defining a cistron as a segment of DNA coding for a polypeptide, the structural gene in a transcription unit could be said as monocistronic (mostly in eukaryotes) or polycistronic (mostly in bacteria or prokaryotes). In eukaryotes, the monocistronic structural genes have interrupted coding sequences—the genes in eukaryotes are split.
The coding sequences or expressed sequences are defined as exons. Exons are said to be those sequence that appear in mature or processed RNA. The exons are interrupted by introns. Introns or intervening sequences do not appear in mature or processed RNA.
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संबंधित प्रश्न
State the difference between the structural genes in a Transcription Unit of Prokaryotes and Eukaryotes.
Explain (in one or two lines) the function of the following:
Exons
In split genes, the coding sequence are called ______.
The correct sequence of gene expression is:
- Formation of the primary transcript
- Regulation of splicing
- Transport of mRNA from the nucleus to the cytoplasm
- Translation
The transcription unit is represented in the diagram given below.
Identify site (i), factor (ii), and Enzyme (iii) responsible for carrying out the process.
The functional unit of DNA molecule that codes for particular gene product is ______.
Exons help in synthesis of ______.
The equivalent of a structural gene is ______
Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by ______.
Which DNA sequence element is found at the 5' end of a transcription unit and serves as the binding site for RNA polymerase?
In prokaryotes, which of the following DNA sequences is typically found in the promoter region?
Which DNA sequence element is located at the 3' end of a transcription unit and signals the termination of transcription?
The Template Strand is also known by which alternative names?
Which strand has a polarity of 3' → 5' and serves as the actual template for RNA synthesis?
With respect to which strand are all coordinates such as 'upstream' and 'downstream' defined in a transcription unit?
The Lac operon in E. coli is an example of which type of mRNA?
Define Introns in the context of eukaryotic split genes.
