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प्रश्न
Describe the process of transcription.
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उत्तर
- During transcription, information of only one strand of DNA is copied into RNA.
- DNA transcription takes place in nucleus in eukaryotes whereas translation occurs in cytoplasm.
- The promotor is located towards 5’ end of structural gene.
- DNA dependent RNA polymerase catalyses polymerisation in 5’→3’ direction. So the DNA strand having 3’→5’ polarity acts as template strand. The other strand of DNA having 5’→3’ polarity is complementary to template strand.
- The information on this strand of DNA is copied on mRNA.
- The terminator is located at 3’ end of coding strand i.e. downstream. It defines the end of the transcription process.
- As the mRNA grows, the transcribed region of DNA molecule becomes spirally coiled and attains (regains) double helical form.
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संबंधित प्रश्न
Give the central dogma of protein synthesis.
Draw a neat and labelled diagram of transcription and processing of hn-RNA
Identify the strand of DNA which acts as a template during transcription.
______ is the sequence of nucleotides that can be read the same in forward and reverse direction.
______ does not play any role in termination and release of a polypeptide chain.
______ refers to the portion of gene which is transcribed but not translated.
What will be the sequence of bases in its transcript if the sequence of bases in the coding strand of a double stranded DNA is 5' - GTTCGAGTC-3'?
Identify the CORRECT statements.
- Conversion of hnRNA to mRNA - Processing
- Removal of introns and joining of exons - Splicing
- Methyl adenosine triphosphate is added to 5'-end of hnRNA- Capping
- Addition of adenylate residues to 5' end in a template-dependent manner - Tailing
Initiation of polypeptide chain in protein synthesis is induced by:
Differentiate between m-RNA, t-RNA and r-RNA.
