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chapter-6-biology-

Chapter 6 vocabulary

TermDefinition
elements substances that make up everything.
atom smallest particle of an element that had the characteristics of that element.
nucleus center of an atom.
isotopes atoms of the same element that have different numbers of neutrons.
compound substance that is composed of atoms of two or more different elements that are chemically combined.
covalent bond a force that holds electrons together.
molecule group of atoms held together by covalent bonds.
ionic bond attractive force between two ions of opposite charge.
ion charged particle made of atoms.
metabolism all of the chemical reactions that occur within an organism.
mixture combination of substances in which the individual components retain their own properties.
solution a mixture in which one or more substances are distributed evenly in another substance.
pH measure of how acidic or basic a solution is.
base any substance that forms hydroxide ions.
polar molecule molecule with an unequal distribution of charge.
hydrogen bond attraction of opposite charges between hydrogen and oxygen.
diffusion net movement of particles from an area of higher concentration to an area of low concentration
dynamic equilibrium condition in which there is continuous movement but no overall concentration change.
isomers compounds that have the same chemical formula but different three dimensional structures.
carbohydrate biomolecule composed of carbon, hydrogen, and oxygen.
lipids large biomolecules that are mostly made of carbon, hydrogen & a small amount of oxygen.
protein large complex polymer composed of carbon, hydrogen, oxygen, nitrogen, & sometimes sulfur.
peptide bond covalent bond formed between amino acids.
nucleic acid complex biomolecule that stores cellular information in the form of a code.
nucleotides polymers made of smaller subunits.
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