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प्रश्न
Describe the process of transcription.
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
Long Answer Question:
Justify the statement. If the answer is false, change the underlined word(s) to make the statement true
The job of mRNA is to pick up amino acids and transport them to the ribosomes.
Long Answer Question:
Justify the statement. If the answer is false, change the underlined word(s) to make the statement true
Transcription must occur before translation may occur.
Find out the double ring compound.
DNA - dependent RNA polymerase catalyzes transcription on the strand of the DNA which is known the ______.
The sequence of nucleotides AUGCUUCUC indicates that it is a segment of ____________.
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.
Which of the following represents the central dogma of molecular biology?
Identify the INCORRECT statement.
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
If there are 300 bases in an RNA which codes for a protein with 100 amino acids, and a base at position 162 is deleted such that the length of RNA become 299, how many codons will be altered.
