Flash Cards

Chapter 3 vocabulary

Term Definition
mixture combination of substances in which individual substances retain their own properties.
organic compounds compounds that always contain carbon and hydrogen and usually are associated with living things.
carbohydrates nutrient that usually is the body's main source of energy.
lipids organic compound found in living things that do not mix with water.
proteins large molecules that contain carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur and is made up of amino acids; used by the body for growth and for replacement and repair of body cells.
matter anything that has mass and takes up space.
energy anything that brings about change.
electron when something is made up of only one kind of atom.
ions electrically charged atoms.
molecular compounds compounds that are formed when different atoms share their outermost electrons.
ionic compounds ions of opposite charges attracted to one another to form electrically neutral compounds.
nucleic acids large organic molecules that store important coded information in cells.
inorganic compounds compounds made from elements other than carbon.
passive transport the movement of substances through the cell membrane without the input of energy.
diffusion the random movement of molecules from an area where there is relatively more of them into an area where there is relatively fewer of them.
equilibrium occurs when molecules of one substance are spread evenly throughout another substance.
osmosis the diffusion of water through a cell membrane.
facilitated diffusion a type of passive transport where substances are so large that they can enter the cell only with the help of transport proteins.
transport proteins used to move substances into and out of the cell.
periodic table chart of elements that provide mass, how many protons, and the symbol of an element


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