NEETZoologyMolecular Basis of Inheritance
Read the following statements regarding the structural gene in a transcription unit and choose the incorrect one.
Options
- AIn eukaryotes, the coding sequences or expressed sequences within a structural gene are defined as introns.
- BThe structural gene in a transcription unit is flanked by the promoter and terminator regions.
- CIn eukaryotes, the structural gene is mostly monocistronic.
- DIn bacteria or prokaryotes, the structural gene is predominantly polycistronic.
Correct answer
A. In eukaryotes, the coding sequences or expressed sequences within a structural gene are defined as introns.
Step-by-step solution
In eukaryotes, the coding sequences or expressed sequences are defined as exons, not introns. Introns are intervening sequences that do not appear in mature or processed RNA. The structural gene in a transcription unit is indeed flanked by the promoter (towards the 5' end of the coding strand) and the terminator (towards the 3' end). Furthermore, eukaryotic structural genes are mostly monocistronic, whereas prokaryotic structural genes are predominantly polycistronic. Therefore, the statement regarding introns bein