Question

In eukaryotic cell transcription, RNA splicing and RNA capping take place inside the
A. ER
B. Ribosomes
C. Nucleus
D. Dictyosomes

Answer 1

Hint: Transcription is the synthesis of an RNA molecule from a DNA template. Transcription is carried out in three different steps, initiation, elongation, and termination. This process is catalyzed by RNA polymerase.

Complete answer:
Transcription is the synthesis of RNA molecules from a DNA template. This process is synthesized by an enzyme called RNA polymerase. Eukaryotes have three RNA polymerases, RNA pol I, RNA pol II, and RNA pol III. RNA polymerase I and III are responsible for transcribing specialized RNA encoding genes. RNA polymerase II is responsible for transcribing protein encoding genes. This process is carried out in three different steps initiation, elongation and termination.
After these steps have taken place, post transcriptional modifications occur. The primary transcript is modified to become functional tRNA, mRNA, and rRNA. These modification takes place by following methods:
Splicing – the structural genes composed of coding and non-coding regions are alternatively separated. Non-coding sequences also called intervening sequences include exons and introns.
Addition of 5 prime caps – in this 5’ cap on the end of primary transcript is altered to form a nucleotide.
Creation of poly A tail – most eukaryotic mRNAs have a string adenine residue which make up the poly A tail.
RNA editing – the RNA is edited to form a specific RNA.
In eukaryotic cells, the process of splicing and capping takes place in the nucleus. The mRNA formed is then transported to the cytoplasm where it is translated by the ribosome.

Thus, the correct answer is option C – nucleus.

Additional Information:
Types of RNA formed post transcription are
mRNA, messenger RNA: it carries the genetic codes from DNA in the nucleus to ribosomes. It is also the site of protein translation in cytoplasm.
rRNA, ribosomal RNA: they synthesize amino acids into protein chains.
tRNA, transfer RNA: it helps to decode the mRNA. They also function at specific sites in ribosomes during translation.

Note:
RNAs are associated with several diseases in human beings. tRNA, if bound to specific protein can result in apoptosis or cell death. They are also involved in Alzheimer’s and generating cancer cells.