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20億は確か2.0 x 10^9でしたよね。
塩基と塩基の長さが0.34nm = 0.34 x 10^-9 m (1 nm=10-9mです)
そうすると全長は2.0 x 10^9x0.34 x 10^-9 (m) = 0.68 (m) =68 (cm)

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