Question
Life Science Application:A $DNA$ model was built using the scale $2\ cm : 0.0000001\ mm.$ If the model of the $DNA$ chain is $17\ cm$ long, what is the length of the actual chain$?$
✓
Answer
Let the length of the actual chain be $x\ mm.$
Therefore.$\frac{2\text{cm}}{0.0000001\text{mm}}=\frac{17\text{cm}}{\text{x mm}}$
$\Rightarrow\text{x}=\frac{17\times0.0000001}{2}$
$=8.5\times0.0000001=0.00000058\text{mm}$
Therefore.$\frac{2\text{cm}}{0.0000001\text{mm}}=\frac{17\text{cm}}{\text{x mm}}$
$\Rightarrow\text{x}=\frac{17\times0.0000001}{2}$
$=8.5\times0.0000001=0.00000058\text{mm}$
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