| A | B |
|---|
| cell | the smallest unit that performs all the activities of life |
| organism | any living thing |
| Characteristics of life | Organization, ability to grow, reproduce and respond |
| Needs of life | Energy, Materials and Space |
| unicellular | an organism consisting of one cell that exists on its own |
| multicellular | an organism made of many cells working together |
| microscope | an instrument that makes objects appear bigger |
| cork cells | the first cells seen under a microscope that were described as little rooms by Robert Hooke |
| Cell Theory | Every living thing is made of cells. Cells carry out the functions needed to support life. Cells come only from other living cells. |
| Bacteria | Sincle celled organism that does not contain a nucleus or any organelles. The genetic material (DNA) can be found in the cytoplasm. |
| organelle | any part of a cell enclosed by a membrane |
| cell membrane | a soft permeable enclosure that separates the inside and the outside of the cell. It allows some material to pass through. |
| cytoplasm | a gelatin like substance contained inside the cell membrane |
| nucleus | a structure inside the cell that contains the genetic (or heredity) material that controls the cell's activity. |
| eukaryotic cell | a cell that has the genetic material (DNA) inside the nucleus |
| prokaryotic cell | a cell that has the genetic material in the cytoplasm and has no nucleus or other organelles. |
| DNA | the genetic (or heredity) material in a cell that directs or instructs the processes of the cell |
| cell wall | a tough outer coating that a plant cell has in addition to the cell membrane. It supports and protects the plant cell. |
| mitochondria | an organelle in plant and animal cells that uses oxygen to help the cell get energy from its fool |
| chloroplast | an organelle in a plant cell that enables the plant cell to make sugar from sunlight |
