Question

Consist of two statements – Assertion (A) and Reason (R). Answer thesequestions selecting the appropriate option given below: Assertion:Ribosomal RNA is synthesized in the nucleus of the cell.

Reason: It is translated with the enzyme RNA polymerase III.
a) Both A and R are true and R is the correct explanation of A.
b) Both A and R are true and R is not the correct explanation of A.
c) A is true but R is false.
d) A is false but R is true.

Answer 1

Ribosomal RNA (rRNA) is indeed synthesized in the nucleus of the cell, which is a correct statement. However, RNA polymerase I is responsible for the transcription of rRNA, not RNA polymerase III, and rRNA is not translated into proteins. Thus, the correct answer is c) A is true but R is false.

Step-by-step explanation:

When addressing the question about the synthesis of ribosomal RNA (rRNA) and its relation to RNA polymerase III, it is important to examine the role of rRNA within the cell and the process through which it is synthesized. The assertion states that rRNA is synthesized in the nucleus of the cell, which is a correct statement. rRNA, a crucial component of the ribosomes, is indeed synthesized in the nucleus.

Specifically, in eukaryotic cells, the nucleolus region of the nucleus is responsible for the synthesis, processing, and assembly of rRNAs into ribosomes.The reason provided is that rRNA is translated with the enzyme RNA polymerase III, which is an incorrect statement. The correct enzyme is not RNA polymerase III but RNA polymerase I which is responsible for transcribing rRNA, except for the 5S rRNA.

RNA polymerase III is involved with the synthesis of tRNA and other small RNAs but not the rRNA. Moreover, the term translated is not applicable to rRNA, since rRNA is not translated into proteins; instead, it forms part of the ribosome's structure and is involved in the protein synthesis process.

Therefore, the correct option is c) A is true but R is false.