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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
Very Short Answer Question:
Why the genetic code is considered as commaless?
How t-RNA act as an adapter molecule?
Explain in detail with the help of a diagram.
Which of the following is the function of a nonsense codon?
In following case what will be the corresponding sequence of the transcribed mRNA?
AGGTATCGCAT is a sequence from the coding strand of a gene.
Identify the cell organelle that serves as a site of protein synthesis.
____________ is the initiation codon.
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
Which one of the following is NOT a structural part of a transcription unit in DNA?
Given,
Transcription (eukaryotic) : Nucleus; similarly, Transcription (prokaryotic) : ______ ?
Choose the correct option.
DNA is not involved directly in the synthesis of______.
