Biological buffers should

You analyze a DNA sample which gives an A260 of 1.15 and an A280 of 0.67. What is the concentration of this DNA sample, and is it sufficiently pure?

You need to centrifuge a 1 ml sample at 7000 g, separate soluble and insoluble components, and visualize the pellet inside the tube afterwards. Which of the following should you use?  

Mycobacterium tuberculosis is a potentially lethal organism that has an inhalation route of entry. Current treatment involves taking several antibiotics together.  A lab that studies this organism would be assigned a rating of

In NIH study sections at the Center for Scientific Review,

You wish to include a picture of a gel in a paper. Which of the following is NOT acceptable?

Absorbance and concentration are ________ related, while absorbance and transmittance are ________ related.

It is important to conduct double-blind experiments when possible to

A researcher receives a five year grant from the NIH, and a percentage of the grant money is given to the Office of Research. This is considered

A protein has a concentration of 30 μM, and 3 tryptophans (ε = 5500) and 2 tyrosines (ε = 1490). What is its absorbance?