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17 terms

Essential Biology: Chapter 2

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Cell
a basic unit of living matter separated from its environment by a plasma membrane
macromolecules
a giant molecule in a living organism: a protein, polysaccharide, or nucleic acid
elements
a substance that cannot be broken down to other substances by chemical means. Scientists recognize 92 chemical elements occurring in nature
compounds
a substance containing two or more elements in a fixed ratio; an example table salt
structure of atoms
A nucleus, and electron rings
nucleus
the center of an atom, contains protons and nuetrons
protons
positively charged subatomic particle
electrons
negatively charged subatomic particle(smallest thing possible)
neutrons
neutrally charged subatomic particle
ionic bonds
the transfer of electrons from one atom to another
covalent bonds
the sharing of electrons with 2 or more
water
earth's solvent for life, most common substance on earth, without it we would be dead, earth is habitable because of water
structure of water
2 hydrogens(positive) 1 oxygen(negative)
cohesion
the attraction between molecules of the same kind
aqueous solution
when water is the solvent, it is an aqueous solution
solute
the solid in a solution
solvent
the liquid in a solution