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प्रश्न
Depending upon the chemical nature of the template (DNA or RNA) and the nature of nucleic acids synthesised from it (DNA or RNA), list the types of nucleic acid polymerases.
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उत्तर
The types of nucleic acid polymerases required for the synthesis of DNA and RNA are:
- DNA polymerase I, II, and III: They help in the replication of DNA.
- RNA-dependent DNA polymerase: It helps in the synthesis of DNA from RNA (reverse transcription).
- DNA-dependent RNA polymerase: It helps synthesise RNA from DNA (transcription).
In eukaryotes, there are at least three RNA polymerases in addition to those found in cell organelles.
- RNA polymerase I transcribes rRNA (28S, 18S and 5.8S).
- RNA polymerase II transcribes the precursor of mRNA called heterogeneous nuclear RNA (hnRNA).
- RNA polymerase III transcribes tRNA, 5SrRNA and snRNAs.
संबंधित प्रश्न
Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?
To initiate translation, the mRNA first binds to ______.
In transcription in eukaryotes, heterogeneous nuclear RNA (hnRNA) is transcribed by ______.
In eukaryotes, the process of processing of primary transcript involves ______.
On the ribosome, mRNA binds ______ and two sites in the ______ for subsequent amino acids to bind to be close enough to each other for the formation of a peptide bond.
A special feature of viruses is that they:
Ribozyme is a/an:
The most likely method, used to determine the structural details of the cell organelle is ______.
Which of the following pair lack the unit membrane?
A ribozyme is an:
Refer the given diagram. What does it represent?
Which is the “Only enzyme” that has “Capability” to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?
What are the functions of methylated guanasine cap?
What are the functions of poly-A “tail” in a mature on RNA?
- Assertion: Ribosomal RNA is synthesized in the nucleus of the cell.
- Reason: It is translated with the enzyme RNA polymerase III.
What is the consensus sequence of the –10 region (Pribnow Box) in bacterial promoters?
In which direction does RNA polymerase move along the template strand during bacterial transcription elongation?
Which mechanism of transcription termination in bacteria does not require a protein factor?
Which DNA sequence element serves as the primary recognition site for the sigma factor in bacterial promoters?
Between rho-independent and rho-dependent termination, which mechanism is also known as intrinsic termination?
