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 |