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NEET BIOLOGYMolecular Basis of InheritanceMedium

Question

Identify the correct statement:

A

The coding strand in a transcription unit is copied to an mRNA.

B

Split gene arrangement is characteristic of prokaryotes.

C

In capping, methylguanosine triphosphate is added to the 3' end of hnRNA.

D

RNA polymerase binds with the Rho factor to terminate the process of transcription in bacteria.

Step-by-Step Solution

According to the text regarding transcription in bacteria:

  1. Statement A is incorrect: The strand with polarity 3'->5' acts as a template, while the other strand (5'->3') is called the coding strand. The coding strand is displaced, not copied; the RNA sequence is the same as the coding strand (except Uracil replaces Thymine), but it is copied from the template strand.
  2. Statement B is incorrect: The split-gene arrangement (presence of introns and exons) is characteristic of eukaryotes, not prokaryotes.
  3. Statement C is incorrect: In capping, methylguanosine triphosphate is added to the 5' end of hnRNA, not the 3' end (where tailing occurs).
  4. Statement D is correct: The RNA polymerase is only capable of catalysing elongation. It associates transiently with the termination-factor (Rho factor) to terminate the transcription.

Exam Context & Concepts Covered

This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Molecular Basis of Inheritance. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

BIOLOGYMolecular Basis of Inheritanceidentifycorrectstatement

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