NEET Botany DNA Structure MCQ Question
Which of the following statements about the structure of DNA are correct?
The template strand of DNA has a polarity of 3' to 5'.
The coding strand of DNA is identical to the RNA sequence, except for the presence of thymine instead of uracil.
Both strands of DNA are used for transcription in eukaryotic genes.
Exons are interrupted by introns in eukaryotic genes, and introns are not present in mature RNA.
Correct Answer
Detailed Explanation
Statement A is correct because the template strand of DNA is indeed 3' to 5' in polarity. Statement B is misleading; while the coding strand matches RNA (except for thymine), it doesn't clarify that the coding strand is not identical in terms of function. Statement C is incorrect as only one strand is used for transcription. Statement D correctly states the role of exons and introns but is misleading as it implies introns are absent in mature RNA.
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