You wish to study the effects of substrate concentration on enzyme rate. For the experiment, you alter the substrate concentration and measure the change in enzyme rate, while making sure the enzyme concentration is constant in each sample. Which is the control?

A published clinical study shows a drug is ineffective against a disease, but doctors continue to prescribe it due to some of their patients reporting that the drug is working. This is an example of 

A type of centrifugation used in the lab to collect large volumes (e.g. 1 L bottles) of bacterial cells is

You add some Folin reagent to a lysate sample, and it turns slightly blue. This is a(n) ________ measurement.

Amino acids differ due to their unique

A protein has an absorbance of 0.41, and 6 tryptophans (ε = 5500) and 4 tyrosines (ε = 1490). What is its concentration?

You have a stock of DNA ligase at 50,000 units/µl. You need 10,000 units of ligase in a 20 µl reaction, how many microliters of ligase do you need?

When using a pipette, the greatest accuracy is achieved by

The following represents a centrifuge rotor. Where should you place 5 tubes to ensure the centrifuge is properly balanced?

Which type of rotor is best to use if you wish to separate a sample into a pellet and supernatant?