Which of the following are the 4 essential elements that make up 96% of living matter?

Which macromolecules contain nitrogen?

Which macromolecule contains phosphorus? (Always true, not sometimes)

Which macromolecule contains sulfur?

Which of the following describes an isotope?

Which energy level has the highest amount of energy?

This type of bond results from unequal sharing of electrons.

This type of bond results from the gain or loss of electrons.

This type of bond results from an electronegative atom bonded to a hydrogen attracted to another electronegative atom.

This type of bond results from equal sharing of valence electrons.