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Biology Chapter 2 Vocabulary Test

Terms in this set (20)

Atom
basic unit of life
Element
substance consisting entirely of one type of atom
Isotope
atom of an element that has a number of neutrons different from that of other atoms of the same element
Compound
substance formed by the chemical combination of two or more elements in definite proportions
ionic bound
bond formed when one or more electrons are transferred from one atom to another
Ion
atom that has a positive or negative charge
covalent bond
bond formed by the sharing of electrons between atoms
Cohesion
Attraction between molecules of the same substance
Adhesion
attraction between molecules of different substances; in plants, attraction between unlike molecules
Solute
substance that is dissolved in a solvent to make a solution
Solvent
substance in which a solute is dissolved to form a solution
Acid
compound that forms hydrogen ions (H+) in solution
Base
compound that produces hydroxide ions (OH+) in solution
Monomer
small unit that can join together with other small units to form polymers
Polymer
large compound formed from combinations of many monomers
Deoxyribnucleic acid (DNA)
nucleic acid that contains the sugar deoxyribose
Reactant
element or compound that enters into a chemical reaction
product
element or compound produced by a chemical reaction
Activation energy
Energy needed to get a reaction started
catalyst
substance that speeds up the rate of a chemical reaction
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