What is the concentration of DNA whereby a 1:100 dilution has an absorbance reading of 0.015 at 260 nm?

Question

Quizplus · Accepted Answer

To calculate the concentration of DNA, we need to use the Beer-Lambert law: A = ɛlc, where A is the absorbance, ɛ is the molar extinction coefficient, l is the path length, and c is the concentration. In this case, we know that the absorbance is 0.015, and we are diluting the DNA 1:100, which means that the path length is also reduced by a factor of 100. We can assume that the molar extinction coefficient for DNA at 260 nm is approximately 50 µg/mL·cm. 
Therefore, 
0.015 = (50 µg/mL·cm) x (1 cm/100) x c 
c = 75 µg/mL (or 75 ng/µL or 0.075 mg/mL) 
Therefore, the answer is C.

What Is the Concentration of DNA Whereby a 1:100 Dilution μ\muμ

What Is the Concentration of DNA Whereby a 1:100 Dilution $\mu$