Question

Describe the process of transcription.

Answer 1

1. During transcription, information of only one strand of DNA is copied into RNA.
2. DNA transcription takes place in nucleus in eukaryotes whereas translation occurs in cytoplasm.
3. The promotor is located towards 5’ end of structural gene.
4. 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.
5. The information on this strand of DNA is copied on mRNA.
6. The terminator is located at 3’ end of coding strand i.e. downstream. It defines the end of the transcription process.
7. As the mRNA grows, the transcribed region of DNA molecule becomes spirally coiled and attains (regains) double helical form.