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What is the purpose of diethylpyrocarbonate (DEPC) in nucleic acid extraction protocols?

What property of trypan blue and similar liquids contributes to errors or inaccuracies in measurements, especially when pipetting? In other words, what led to your obtaining pipetting CV values greater than 10% during your skills assessment (assuming, of course, you weren’t yet a pipet champ)?

What is the purpose of loading dye in agarose gel electrophoresis?

An apartment complex with 342 apartments is being built. Each workday, a heating and air-conditioning system can be installed in 9 apartments. How many workdays will it take to install all of the systems? [BLANK-1]

Divide the following numbers to obtain the correct quotient.27,900 amperes ÷ 155 = [BLANK-1]

In a two digit whole number the second column from the right in the number represents units.

Add the following numbers to obtain the correct sum:    8,519    2,221       654   +     9 [BLANK-1]

Add the following numbers to obtain the correct sum.2,377 + 512 + 1,893 + 384 = [BLANK-1]

Add the following numbers to obtain the correct sum.983 + 351 = [BLANK-1]

When multiplying two numbers, do not forget to include the units in the answer.