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vocab chapter 2
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41
Biology
10th Grade
11/29/2010

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Term
acid
Definition
compounds that forms hydrogen ions (H+) in solution
Term
activation energy
Definition
energy needed to get a reaction started
Term
adhesion
Definition
attraction between molecules of different substances; in plants, attraction between unlike substances
Term
amino acid
Definition
compound with an amino group (-NH2) on one end and a carboxyl group (-COOH) on the other end
Term
atom
Definition
basic unit of matter
Term
base
Definition
compound that produces hydroxide ions (OH+) in solution
Term
buffer
Definition
weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes s pH
Term
carbohydrate
Definition
compound made up of carbon, hydrogen, and oxygen atoms; major source of energy for the human body
Term
catalyst
Definition
substance that speeds up the rate of a chemical reaction
Term
chemical reaction
Definition
process that changes one set of chemicals into another set of chemicals
Term
cohesion
Definition
attraction between molecules of the same substance
Term
compound
Definition
substance formed by the chemical combination of two or more elements in definite proportions
Term
covalent bond
Definition
bond formed by the sharing of electrons between atoms
Term
deoxyribonucleic acid (DNA)
Definition
nucleic acid that contains the sugar deoxyribose
Term
electron
Definition
negativly charged particle; located outside of the atomic nucleus
Term
element
Definition
substance consisting entirely of one type of atom
Term
enzyme
Definition
protein that acts as a biological catalyst
Term
ion
Definition
atom that has a positive or negative charge
Term
ionic bond
Definition
bond formes when one or more electrons are transfered from one atom to another
Term
isotope
Definition
atom of an element that has a numver of neutrons different from thjat of other atoms of the same element
Term
lipid
Definition
macromolecule made mainly from carbon and hydrogen atoms; includes fats, oils, waxes
Term
mixture
Definition
material composed of two or more elements or compunds that are physically mixed together but not chemically combined
Term
molecule
Definition
smallest unit of most compounds
Term
monomer
Definition
small unit that can join together with other small units to form polymers
Term
monosaccharide
Definition
single sugar molecule
Term
nucleic acid
Definition
macromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosperous
Term
nucleotide
Definition
monomer of nucleic acids mad up of a 5-carbon sugar, a phospate group, and a nitrogenous base
Term
nucleus
Definition
the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material(DNA) and controls the cell's activities
Term
pH scale
Definition
measurment system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0-14
Term
polymer
Definition
large compound formes from combinations of many monomers
Term
polysaccharide
Definition
large macromolecule formed from monosaccharides
Term
product
Definition
element or compound produced by a chemical reaction
Term
protein
Definition
macromoleule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair and to make up enzymes
Term
reactant
Definition
element or compound that enters into a chemical reaction
Term
ribonucleic acid (RNA)
Definition
single-stranded nucleic acid that contains the sugar ribose
Term
solute
Definition
substance that is dissolved in a solvent to make a solution
Term
solution
Definition
mixture of two or more substances i nwhich the molecules of the substances are evenly distributed
Term
solvent
Definition
substance in which a solute is dissolved to formed a solution
Term
substrate
Definition
reactant of an enzyme-catalyzed reaction
Term
suspension
Definition
mixture of water and nondissolved materials
Term
van der Waals forces
Definition
a slight attraction that developes between the opposity charged regions of nearby molecules
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