Question

1. in the equation a = 0.012c + 0.045, what does c represent?

a. protein absorbance
b. protein concentration (μg/ml)
c. molar extinction coefficient
d. dye concentration

Explanation:

In the Beer - Lambert law - related equations (which this equation resembles), when dealing with protein assays, the equation \(A = \epsilon lC + b\) (where \(A\) is absorbance, \(\epsilon\) is molar extinction coefficient, \(l\) is path length, \(C\) is concentration). In the given equation \(A = 0.012C+0.045\) (assuming a simplified form where path length and molar extinction coefficient are combined as a single constant \(0.012\)), \(C\) typically represents protein concentration. Options A (absorbance is \(A\)), C (molar extinction coefficient is part of the coefficient \(0.012\) if we consider Beer - Lambert law form), and D (not relevant to a general protein - absorbance relationship) can be eliminated.

Answer:

B. Protein concentration (μg/mL)