Question

A DNA molecule contains $10,000$ base pairs, then the length of this DNA molecule is?

• A. $3.4\times {10}^{-5}$ meter
• B. $0.34\times {10}^{-5}$ meter
• C. $34\times {10}^{-5}$ meter
• D. None of the above

Answer 1

Answer: (A)

$3.4\times {10}^{-5}$ meter

Answer is option A i.e. "$3.4\times {10}^{-5}$ meter"
Base pair describes the relationship between the building blocks on the strands of DNA. For B-DNA, length of DNA is equal to product of number of base pairs and rise per vertical base pair i.e. 3.4 Å * 10,000 = 34,000 Å = 3.4 μm or $3.4\times {10}^{-5}$ meter