Question Detail
Question
Consider the following statements regarding a DNA segment 1000 base pair long: 1. It measures 3400 A. 2. It has 10 complete turns. 3. It has 100 nucleotides. 4. The RNA synthesized from it carries 1000 nucleotides. Which of the statements given above are correct?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Statement 1 is correct: B-form DNA has a length of 3.4 Å per base pair, so 1000 base pairs measure 3400 Å. Statement 4 is correct: RNA synthesized from a DNA template is complementary and will also have 1000 nucleotides (assuming the entire segment is transcribed). Statement 2 is incorrect because B-form DNA has about 10 base pairs per turn, so a 1000 bp segment has approximately 100 turns, not 10. Statement 3 is incorrect because a 1000 bp segment contains 2000 nucleotides (1000 base pairs × 2 strands).
Hint
Recall the structural parameters of B-DNA, including length per base pair and base pairs per turn.