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प्रश्न
Draw a neat and labelled diagram of transcription and processing of hn-RNA
Explain processing of hn-RNA with the help of neat and labelled diagram.
उत्तर १
उत्तर २
- In eukaryotes, forms of RNA transcribed from DNA are called primary transcripts. Such transcripts undergo changes called processing or maturation before becoming functional.
- The primary transcript is non-functional and contains both exons and introns.
- During processing, only introns are removed by the process called splicing.
- Exons are joined in a definite sequence (order) by the DNA ligase enzyme.
- Heterogeneous nuclear RNA undergoes the process of capping and tailing.
- In capping, methylated guanosine triphosphate is added to the 5’ end of hnRNA.
- In tailing, polyadenylation (addition of multiple adenine nitrogen bases) takes place at 3’end.
- It is the fully processed hnRNA, now called m-RNA.
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संबंधित प्रश्न
Attempt any TWO of the following:
Define the terms ‘codon’ and ‘anticodon’.
Multiple Choice Question:
Which of the following is NOT part of protein synthesis?
Which process is shown in the following diagram?
Changes in the nucleotide of gene : Mutation : : Changes in the place of ribosome : __________
Define Translocation.
DNA - dependent RNA polymerase catalyzes transcription on the strand of the DNA which is known the ______.
Study the following sentences and select the correct option.
- Addition of one or two bases changes the combination of sequence in codons.
- Addition or deletion of single nucleotide changes the reading frame.
- The reading frame beyond the point of insertion of three bases remains unaltered.
Number of amino acids in a polypeptide chain is 150. The number of mRNA bases required is ____________.
Which one of the following is NOT essential for synthesis of protein in a normal cell?
Explain the process of binding of ribosomal units to mRNA during protein synthesis.
