Answer:
500 uL
Explanation:
Our stock is 25 mg/mL. This means for every mL (1000 uL) there are 25 mg of lysozyme, and we need 12.5 mg.
So 25/ 1000 uL = 12.5/ X
X= (12.5 mg x 1000 uL)/ 25
X= 500 uL
We need to add to our solution 500 uL of the lysozyme stock.