Mass of human DNA molecule is 1 fg. It may be expressed in kilogram as :

Options

A. `1 xx 10^(-12 ) kg `
B. `1 xx 10^(-15) kg`
C. `1 xx 10^(-18) kg `
D. `1.8 xx 10^(-9) kg `

Answer

C

Explanation

`1fg = 10^(-15) g`
`1 = (10^(-15) g)/(1 fg)`
Now ` 1g = 10^(-3) kg `
`1 = (10^(-3) g)/(1g)`
` 1fg = 1 fg xx ( (10^(-15) g)/(1fg) ) xx ( (10^(-3) kg)/(1g) )`
` = 10^(-18) kg `