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26 Cards in this Set

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atom
smallest unit of matter that cannot be broken down by chemical means
element
substance composed of a single type of atom
compound
substance that is made of mode than one kind of atom
molecule
group of atoms held together by covalent bonds
ion
electrically charged atom or molecule
cohesion
attraction between substances of the same type
adhesion
attraction between different substances
solution
homogeneous mixture of two or more substances
acid
compound that increases the concentration of hydrogen ions in a solution
base
compound that reduces the concentration of hydrogen ions in a solution
carbohydrate
organic compound composed of carbon, hydrogen, and oxygen; used by living things as an energy source
monosaccharide
simple sugar that is the base unit of carbohydrates
lipid
one of a family of nonpolar molecules that are not soluble to water; includes fats, phospholipids, and steroids
proteins
organic compounds made of amino acids
amino acids
organic molecule that is the building block of proteins
nucleic acids
organic molucule made of nucliotides
nucleotides
subunit of nucleic acids consisting of a nitrogenous base, a sugar, and a phosphate
DNA
double-stranded, helical nucleic acid that stores hereditary information
RNA
a type of nucleic acid involved in protein synthesis
ATP
organic molecule composed of a base, a sugar, and three phosphate groups that act as the main energy currency of a cell
energy
capacity for doing work the ability to move or change matter
activation energy
amount of energy required to start a chemical reaction
enzyme
substance that speeds up a chemical reaction
substrate
the substance with which an enzyme acts during a chemical reaction
active site
site on an enzyme that attaches to a substance
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