An example of a grad-school level question?
An important rule for students to know when heating a test tube is to

An example of a grad-school level question?
A student wraps a wire around an iron nail. The student then connects the wire to a battery. The nail attracts another nail and they stick together. What force holds the two nails together?

An example of a grad-school level question?
A lipid bilayer allows certain molecules to pass through and blocks other molecules. Which structure is most often protected by a lipid bilayer?

An example of a grad-school level question?
What information is needed to calculate the speed of a car?