This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on “Molecular Basis of Inheritance – Process of Transcription in Eukaryotes”.
1. What is the role of RNA polymerase III?
a) Transcription of rRNAs
b) Transcription of mRNAs
c) Transcription of tRNAs
d) Transcription of hnRNA
Explanation: rRNAs are transcribed with the help of RNA polymerase I. RNA polymerase II is responsible for the transcription of mRNA, which is the heterogeneous nuclear RNA (hnRNA). RNA polymerase III transcribes the tRNAs, 5srRNAs and snRNAs.
2. What is the name of the process where the introns are removed and the exons are joined together in a defined order?
Explanation: The primary transcript consists of both the exons and the introns, and they are non-functional. And so, the introns are removed and the exons are arranged in a well-defined manner. This process is called as splicing.
3. Which of the following types of RNA undergoes an additional process of capping and tailing during transcription?
Explanation: hnRNA undergoes the process of splicing. But in addition to that, it also undergoes the processes of capping and tailing. In splicing, the introns are removed and the exons are arranged together.
4. Which of the following is the unusual nucleotide that is added to the 5’-end of the hnRNA during capping?
a) Methyl Guanosine Triphosphate
d) Adenosine Triphosphate
Explanation: In addition to the splicing process that the hnRNA undergoes, it also undergoes the processes of capping and tailing. During the process of capping, the unusual nucleotide (i.e) Methyl Guanosine Triphosphate is added to the 5’-end of the hnRNA.
5. What is the approximate count of the total number of adenylate residues that are added to the 3’-end of the hnRNA during the process of tailing?
Explanation: During the additional process of tailing that is undergone by the hnRNA, adenylate residues are added to it. An approximate count of 200-300 adenylate residues are added to it at the 3’-end of the hnRNA.
6. Which of the following process represents the domination of the RNA-world?
Explanation: The ancient feature of a genome is represented by its split-gene arrangements. The presence of introns is a reminiscent of its antiquity. And so, the process of splicing gives a representation about the domination of the world of RNA (RNA-world).
Sanfoundry Global Education & Learning Series – Biology – Class 12.
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