| A | B |
|---|
| group of symbols showing the number and kind of each atom in a compound | chemical formula |
| non-protein molecule that helps enzymes in reactions | coenzyme |
| substance composed of two or more atoms of different elements joined by a chemical bond | compound |
| minimum amount of energy needed to start a chemical reaction | activation energy |
| energy of motion | kinetic engergy |
| substance composed of only one type of atom | element |
| solution with a greater concentration of hydrogen ions than hydroxide ions | acid |
| region occupied by electrons moving around the nucleus of an atom | electron cloud |
| organic compound composed of hydrogen and oxygen with a ratio of two hydrogen atoms to each oxygen atom | carbohydrate |
| type of bond formed when atoms combine by sharing electrons | covalent |
| solution with a great concentration of hydroxide ions than hydrogen ions | base |
| protein that lowers the energy needed to start a reaction | enzyme |
| stored energy | potential energy |
| compound that is the building block of a protein molecule | amino acid |
| the movement of particles across a plasma membrane involving the use of cell energy | active transport |
| some cells rid themselves of wastes or secrete substances needed elsewhere through this process | exocytosis |
| the concept that forms the basis of modern biology | the cell theory |
| the diffusion of water | osmosis |
| a small sac formed by a membrane | vesicle |
| water, lipids, and lipid-soluble substances moved across membranes by this process | passive processes |
