| A | B |
|---|
| active transport | the transport of molecules by cells from an area of low to high concentration; requires energy |
| amino acids | any one of several building blocks of protein |
| cell | the basic units of structure and function of all livng organisms |
| cell membrane | the thin boundry between the cell and its environment |
| cell respiration | the process, in the cell, where nutrients are broken apart, releasing the chemical energy stored in them |
| chloroplast | the green organelle that contains chlorophyll; where photosynthesis takes place |
| circulation | the flow of mterials within a cell as well as between parts of a multicellular organism |
| cytoplasm | the jellylike substance that is between the cell membrane and the nucleus and that contains the organelles |
