a) Mention two events in which DNA is unzipped.
b) Predict the consequences when both the template and the coding strands of a DNA segment participate in transcription process?
Answers
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(A) Two events in which DNA is unzipped are :
● Replication : in the process of replication two strands separate and act as a template for the synthesis of new complementary strands of a DNA.
● Transcription : it is a process of copying genetic information from one strand of DNA to RNA. In transcription only a segment of DNA and only one of the strands is copied into RNA.
(B) if both strands of DNA participate in transcription process then :
● both strands will act as a template hence they would code for RNA molecule with different sequences, and in turn, the code for proteins, the sequence of amino acids in the proteins would be different.
● two RNA molecules if produced simultaneously would be complementary to each other, hence would form a double stranded RNA. This would prevent RNA from being translated into protein and the exercise of transcription would become a futile one.