QUALITATIVE   :   

This is scientific observation that is not based measurements and numbers.

QUANTITATIVE   :   

The scientific observations that are based on measurements and numbers.

QUANTUM MECHANICS   :   

The physical theory of the composition and behavior of atoms and subatomic particles; explains the duality of light as wave and particle, the existence of chemical bonds, and radioactivity.

QUANTUM THEORY   :   

The theory that states that energy can only be absorbed or radiated in discrete values or quanta. Quantum theory is extended to all particles.

QUARK   :   

An elementary particle that is thought to be the fundamental structural unit from which all particles are made. Up, down, strange, charm, top and bottom are six types of quarks.

QUINONE   :   

An enzymatic cofactor that plays an important role in photosynthesis and respiration. More specifically, it is part of the electron transport chain in mitochondria and chloroplast membranes.