The ________ of a cell membrane indicates how easy it is for substances to cross.

If a cell has 18 chromosomes and undergoes mitosis how many chromosomes would each daughter cell have?

A(n) ________ is a pure substance composed of atoms of only one kind.

When a stretched spring is moving back to its original position is _____ energy

– heavy subatomic particle that has a positive electrial charge; found in an atom’s nucleus

Compounds that do not usually contain carbon and hydrogen atoms as the primary structural ingredients are called ________ molecules.

In general, the nervous system does each of the following except

A(n) ________ bond is a covalent bond that stores an unusually large amount of energy.

Which of the following is the strongest bond?

The reaction N2 + 3 H2 2 NH3 is an example of a(n) ________ reaction.