Advertisements
Advertisements
Question
Describe the process of transcription.
Advertisements
Solution
- 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.
APPEARS IN
RELATED QUESTIONS
Sketch and label the ‘clover leaf model’ of t-RNA.
Multiple Choice Question:
Translation occurs in the _______.
Multiple Choice Question:
Which of the following is NOT part of protein synthesis?
What is central dogma of molecular biology?
From the following identify the features of "Genetic code".
(i) It is a triplet or three letter code.
(ii) The code is overlapping.
(iii) The code is commaless.
(iv) The genetic code was deciphered by Watson and Crick.
Identify the condition under which there will be no change in the reading frame of following mRNA.
5' AACAGCGGUGCUAUU 3'
____________ refers to the mechanism in which codons of mRNA are translated and specific amino acids in a sequence form a polypeptide on ribosomes.
Number of amino acids in a polypeptide chain is 150. The number of mRNA bases required is ____________.
A mature mRNA consists of 900 bases without any stop codon in between. What would be the number of amino acids coded by this mRNA during translation?
______ catalyzes polymerization in 5' → 3' direction during transcription.
