| A | B |
|---|
| cell | smallest unit that can perform all the life processes |
| cell membrane | bilipid layer surrounding the cytoplasm, essential to the cell's metabolism, also called the plasma membrane |
| polar molecule | molecule in which charge is unevenly distributed |
| hydrogen bond | linkage formed when a hydrogen atom in one molecule makes an additional bond to an atom in another molecule |
| nonpolar molecule | molecule woith an even charge distribution |
| phospholipid | molecule found in the cell membrane that is made of two nonpolar fatty acid chains joined to a short polar phosphorus containing head |
| lipid bilayer | the double layer of phospholipids that makes up organelle and cell membranes |
| eukaryote | organisms whose cells contain a membrane-bound nucleus and membrane-bound organelles, such as plants, animals, fungi and protists |
| nucleus | the organelle in eukaryotic cells that contains most of the DNA |
| prokaryote | organism lacking a true nucleus and reproducing by splitting |
| cytoplasm | material inside the cell membrane containing the necessary components for cell life |
| ribosome | cytoplasmic body that contains RNA and produces proteins for the cell |
| organelle | subcellular part such as a ribosome that has a special cellular function |
| mitochondrion | energy-producing organelle in eukaryotes |
| chloroplast | carbohydrate-producing organelles of plants and protists |
| endoplasmic reticulum | network of membranes in the cytoplasm that transports substances made by the cell |
| Golgi body | organelle that delivers substances released by the endoplasmic reticulum of the cell |
| cell wall | firm, non-living covering that encloses and supports most plant, fungal and bacterial cells and some protist cells |
| vacuole | membrane-bound cavity in a cell that serves as a storage area and may function in digestion, secretion, or excretion |
