| A | B |
|---|
| resolution | Determines how sharp an object is |
| cell membrane | Controls what enters and leaves the cell |
| nucleus | The organelle that is the control center of a cell |
| mitochondria | The organelle that produces most of the energy needed by a cell |
| ribosomes | The organelle that produces proteins in the cell |
| bacterial cells | Cells that have no nucleus |
| osmosis | The movement of water from an area of higher concentration to an area of lower concentration |
| cell wall | Protects and support the cell |
| diffusion | The movement of material through a cell membrane without energy |
| active transport | The movement of materials through a cell membrane ehen energy is required |
| vacuoles | Organelle that stores food and other materials |
| lyosomes | Organelles that release chemicals that break down food |
| photoshythesis products | Sugars and oxygen |
| photosynthesis | Cells use the energy in sunlight to make food. |
| respiration | The process by which cells break down glucose and release energy |
| mitochondria | The organelle where energy is released |
| fermentation | The production of energy by a cell without using oxygen |
| lactic-acid fermentation | Caused by too little oxygen in muscle cells |
| mitosis | The stage in the cell cycle where the nucleus divides |
| cytokinesis | The stage in the cell cycle during which two new cells are formed |
| DNA | Shaped like a spiral ladder |
| adenine pairs with__ | cytosine |
| cancer | A disease in which cells grow and divide uncontrollably |
| cancer tumor | A mass of abnormal cells |
| chemotherapy | The use of drugs to kill cancer cells |
| lung cancer | A type of cancer caused mainly by smoking |
| chlorophyll | The pigment that captures energy from sunlight during photosynthesis |
| a pair of nitrogen bases | Forms each rung on the DNA "ladder" |
| stomata | The small opening on a leaf through which oxygen and CO2 can move |
| oxygen | Required by repiration in most cells |
| interphase | The stage of the cell cycle where replication occurs |
| heterotroph | An organism that cannot make its own food |
| replication | The cell makes a copy of the DNA in its nucleus |
