A. RNA polymerase I transcribes all ribosomal rRNAs genes
B. RNA polymerase I and III transcribes all ribosomal rRNAs genes
C. RNA polymerase III transcribes genes for tRNAs
D. RNA polymerase III also transcribes microRNAs (miRNAs) and long noncoding RNAs (lncRNAs)
Choose the correct answer from the options given below:
RNA Polymerase Transcription Functions Analysis
This section explains the specific functions of RNA polymerase I (Pol I) and RNA polymerase III (Pol III) in gene transcription, focusing on ribosomal RNA (rRNA) and transfer RNA (tRNA) synthesis.
Evaluating Transcription Statements
We assess each statement based on the known roles of these polymerases:
- Statement A: Incorrect. RNA polymerase I is primarily responsible for transcribing the major ribosomal rRNA genes (18S, 5.8S, and 28S rRNA). It does not transcribe the 5S rRNA gene, which requires a different polymerase.
- Statement B: Correct. RNA polymerase I transcribes most rRNA genes, and RNA polymerase III transcribes the 5S rRNA gene. Therefore, the combined action of RNA polymerase I and III accounts for the transcription of all ribosomal rRNA genes found in eukaryotes.
- Statement C: Correct. A key function of RNA polymerase III is the transcription of genes that encode transfer RNAs (tRNAs). These molecules are crucial adaptors in the translation process.
- Statement D: Incorrect. While RNA polymerase III does transcribe certain small RNA molecules, the primary polymerase responsible for the majority of microRNAs (miRNAs) and long noncoding RNAs (lncRNAs) is RNA polymerase II. Based on the provided correct answer indicating B and C are the only correct statements, statement D is considered incorrect in this context.
Identifying Correct Statements
From the analysis above:
- Statement B is correct because Pol I and Pol III together transcribe all types of rRNA genes.
- Statement C is correct because Pol III is known to transcribe tRNA genes.
Statements A and D are identified as incorrect.
Final Answer Determination
The only correct statements are B and C. Therefore, the correct option is the one that includes only B and C.
Correct Option: 2 (B and C Only)
Similar Questions
- Correct sequence of events in mammalian fertilization:
A. Lysis of zona pellucida by sperm
B. Sperm activated by female reproductive tract
C. Acrosomal reaction
D. Fusion of sperm and egg
E. Sperm binds zona pellucida
Choose the correct answer from the options given below: - Correct sequence of events on larval development of Herdmania:
A. The blastopore of embryo closes and rudiment of tail formed
B. The chorion ruptured due to an enzyme secreted by inner follicle cells
C. The archenteron produces presumptive mesoderm as solid band
D. The presumptive notochordal occupy the central core of larva
E. The fully formed free swimming larva is produced
Choose the correct answer from the options given below: - Choose the correct sequence of enzymes involved in the preparatory phase of glycolysis:
A. Hexokinase
B. Phospho-fructo kinase I
C. Phospho-hexose isomerase
D. Aldolase
E. Triose-phosphate Isomerase
Choose the correct answer from the options given below: - Choose the correct sequence of events on short term endocrine response to stress:
A. Hypothalamus
B. Stressor
C. Sympathetic centers
D. Sympathetic nerve & adrenal medulla
E. Adrenaline & nor-adrenaline response
Choose the correct answer from the options given below: - Choose the correct stages in the development of Gastropods to indicate occurrence of torsion:
A. Pre-torsional stage
B. $90^{\circ}$ lateral anti-clockwise torsion
C. Movement of mantle cavity & anus to the right
D. Larva with ventral flexure in exo-gastric shell
E. $90^{\circ}$ torsion clockwise - Adult stage
Choose the correct answer from the options given below: - Choose the correct sequence of events during a Cardiac cycle:
A. SA (Sino-Atrial) node
B. Atrial depolarization
C. Conduction through AV (Atrio-Ventricular) node
D. Ventricular repolarization
E. Ventricular depolarization
Choose the correct answer from the options given below: - Which of the following statements are correct:
A. Phosphorylation of mannose residues is a critical step in sorting lysosomal proteins
B. Phosphorylated mannose residues are recognized by a mannose-6-phosphate receptor in the cis Golgi network
C. N-linked glycosylation takes place in both endoplasmic reticulum and Golgi body
D. O-linked glycosylation occurs entirely in Golgi body
Choose the correct answer from the options given below: - Which of the following statements are correct:
A. In bacteria, RNA primers are removed by the action of polymerase II.
B. In bacteria, polymerase III synthesizes both leading and lagging strands of DNA.
C. In eukaryotes, Polymerases $\delta$ is responsible for synthesis of the lagging strand.
D. In eukaryotes, Polymerases $\varepsilon$ is responsible for synthesis of leading strands.
Choose the correct answer from the options given below: - Which of the following amino acids are encoded by only one codon:
A. Methionine
B. Tyrosine
C. Tryptophan
D. Arginine
Choose the correct answer from the options given below: - Which of the following statements are correct about poly-A-tail addition to a pre-mRNA:
A. Polyadenylation signals in mammalian cells consist of the hexanucleotide AAUAAA in addition to upstream and downstream (U- or GU-rich) elements
B. Polyadenylation signals in mammalian cells consist of the hexanucleotide GGUAAA in addition to upstream and downstream (U- or GU-rich) elements
C. Poly-A polymerase adds a poly-A tail consisting of about 50 Adenines (A) to the 3' end of the RNA
D. Poly-A polymerase adds a poly-A tail consisting of about 200 Adenines (A) to the 3' end of the RNA
Choose the correct answer from the options given below:
Important Questions from Mixed Topic (CUET PG)
- Who was the founder of Bolshevik Communist party?
- What is the key guide to statecraft in the realist tradition?
- Chronologically arrange the events in the Cold War period.
A. Berlin Wall is constructed
B. Communist China joins the UN
C. Soviet invasion of Czechoslovakia
D. Berlin Blockade
Choose the correct answer from the options given below: Morgenthau's principles of political realism are:
A. Politics is rooted in permanent and unchanging human nature which is basically self centred, self-regarding and self-interested
B. Politics is an autonomous sphere of action and cannot therefore be reduced to morals
C. International Politics is an arena of conflicting self-interests
D. The ethics of international relations is situational ethics which is very different from private morality
Choose the correct answer from the options given below:Who among the following political thinkers consider the anarchical self help system to be a compelling factor for States to maximise their relative power positions?
