157
Question
1.7 m double helical DNA will have ______ base pairs.
1.7 m double helical DNA will have ______ base pairs.
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Solution
The correct option is A 5×109
Number of base pairs
Length of one complete turn of a DNA double helix = 34 Å = 34 x 10-10 m Number of base pairs in a complete turn of DNA double helix = 10 bp
Therefore, 34×10−10m of DNA has 10 bp
So, 1m of DNA will have = 10/ (34×10−10) bp Thus, 1.7 m of DNA will have = 10×1.7 5×10−9 bp = 5×10−9 bp
Final answer
(B) 5×10−9
Number of base pairs
Length of one complete turn of a DNA double helix = 34 Å = 34 x 10-10 m Number of base pairs in a complete turn of DNA double helix = 10 bp
Therefore, 34×10−10m of DNA has 10 bp
So, 1m of DNA will have = 10/ (34×10−10) bp Thus, 1.7 m of DNA will have = 10×1.7 5×10−9 bp = 5×10−9 bp
Final answer
(B) 5×10−9
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