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the center of an atom, which contains the protons and neutrons; in cells, structure that contains the cell's genetic material in the form of DNA
on of several forms of a single element, which contains the same number of protons but different numbers of neutrons
substance formed by the chemical combination of two or more elements in definite proportions
van der Waals forces
slight attraction that develops between oppositely charged regions of nearby molecules
material composed of two or more elements or compounds that are physically mixed together but not chemically combined
scale with values from 0 to 14; used to measure the concentration of H+ ions in a solution; a pH of 0 to 7 is acidic; a p H of 7 is neutral, and a pH of 7 to 14 is basic
compound made up of carbon, hydrogen, and oxygen atoms; type of nutrient that is the major source of energy for the body
subunit of which nucleic acids are composed; made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair
process that changes, or transforms, one set of chemicals into another set of chemicals
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