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

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