Author: Anonymous

An experiment calls for 325 ml of 45% w/v solution of NaCl (Mw = 58.44). How many grams of NaCl are needed?

You measure a solution containing BSA (ε = 43,824 M-1 cm-1) in the spectrophotometer. The absorbance is 0.5. What is the concentration of BSA?

An experiment calls for 475 ml of 65 mM Tris (Mw = 121.14 g/mol), and you have a 4 M stock of Tris. How many milliliters of Tris are needed to make this solution?

You have a stock of DNA ligase at 50,000 units/µl. You need 5,000 units of ligase in a 25 µl reaction, how many microliters of ligase do you need?

A large gathering of experts in a scientific field (such as the Tuberculosis Consortium, or an Emerging Infectious Diseases Meeting) is a(n)

Which micropipette should be used for the most accurate transfer of 50 microliters?

A 150 kDa protein would consist of approximately ______ amino acids.

You analyze a DNA sample which gives an A260 of 1.56 and an A280 of 0.98. What is the concentration of this DNA sample, and is it sufficiently pure?

How do you prepare 600 ml of 50 mM Tris (Mw = 121.14)?

Which type of rotor allows you to spin samples into the best pellet possible?