Stretching dna with its double-helix structure dna is, Ask an Expert

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Stretching DNA. With its double-helix structure, DNA is coiled like a spring. A biophysicist grabs the ends of a DNA strand with optical tweezers and stretches it 26 nanometers producing 1.2-pN tension in the strand.

Part A What's the DNA's spring constant? Express your answer to two significant figures and include the appropriate units.

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