CBSE 2025 · Region 2 · Set 1 · Q30 · 4 marks
The process of copying the genetic information from one strand of DNA into RNA is termed as transcription. The principle of complementarity of bases governs the process of transcription, also except that uracil comes in place of thymine. Study the complete transcription unit given below and answer the following questions :(a)Name the main enzyme involved in the process of transcription.(b)Identify coding strand and template strand of DNA in the transcription unit. Attempt either sub-part (c) or (d) :Identify (C) and (D) in the diagram, mention their significance in the process of transcription.Describe the location of (C) and (D) in the transcription unit.
The process of copying the genetic information from one strand of DNA into RNA is termed as transcription. The principle of complementarity of bases governs the process of transcription, also except that uracil comes in place of thymine. Study the complete transcription unit given below and answer the following questions :
(a)
Name the main enzyme involved in the process of transcription.
(b)
Identify coding strand and template strand of DNA in the transcription unit.
Attempt either sub-part (c) or (d) :
Identify (C) and (D) in the diagram, mention their significance in the process of transcription.
Describe the location of (C) and (D) in the transcription unit.
Marking-scheme solution
(a)
DNA -dependent RNA polymerase
(b)
B-coding strand, A-Template strand
$\displaystyle \star$ C is promoter, it is the sequence of DNA where the enzyme DNA dependent RNA polymerase binds for initiation of transcription.
$\displaystyle \star$ D is the terminator, it is the sequence of DNA where the process of transcription terminated.
$\displaystyle \star$ C is located towards $\displaystyle 5$′ end (upstream) of coding strand
$\displaystyle \star$ D is located towards $\displaystyle 3$′ end (downstream) of coding strand
Molecular Basis of InheritanceTranscriptionUnderstandcase_studymedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.