| A | B |
|---|
| Cell | smallest unit of living organisms |
| Homeostasis | maintenance of physiological equilibrium |
| Tissue | group of identical specialized cells working together to perform one function |
| Organ | several tissues working together to perform one function |
| Organism | living structure |
| Prokaryotic | refers to organisms that do not contain a nucleus |
| Eukaryotic | refers to organisms that contain a nucleus |
| Unicellular | refers to organisms consisting of only one cell |
| Multicellular | refers to organisms made of more than one cell |
| Organelles | intracellular structures which help cells to function |
| Cytoplasm | internal area of the cell |
| Cell Membrane | phospholipid bilayer which controls what enters and leaves the cell |
| Nucleus | area of the cell containing chromosomes |
| Nucleolus | structure within the nucleus containing RNA for ribosomes |
| Ribosome | protein and RNA structure where proteins are made |
| Smooth endoplasmic reticulum (RER) | membranous structure where non-protein molecules are made |
| Rough endoplasmic reticulum (SER) | membranous structure where extracellular proteins molecules are made |
| Golgi apparatus | flattened membranous sacs where proteins are modified |
| Vesicle | membranous sacs |
| Lysosome | membranous sacs containing enzymes |
| Vacuole | membranous sacs used for storage |
| Mitochondria | double membrane organelle where cell respiration takes place |
| Chloroplast | organelle where photosynthesis takes place |
| Cytoskeleton | long proteins used for intracellular structure and transport |
| Cilium | hair-like extracellular structure used for movement |
| Flagellum | whip-like extracellular structure used for movement |
| Cell wall | found outside cell membrane of pant cells and some bacteria |
| Centrioles | cylindrical structures found in pairs in animal cells which duplicate during mitosis |
