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Ch7 Cells
Cellular Structure and Function
Term | Definition |
---|---|
Cell | The basic unit of structure and organization of all living organisms. |
Cell Theory | 1. Organisms are made up of one or more cell. 2. Cells are the basic unit of life. 3. All cells come from other cells. |
Plasma Membrane | A special boundary that helps control what enters and leaves the cell. |
Organelle | Specialized structures that carry out specific cell functions |
Eukaryotic Cell | A cell that contains a nucleus and other organelles that our bound by a membrane. |
Prokaryotic Cell | A cell without a nucleus or other membrane-bound organelles (most single cell organisms) |
Nucleus | Central organelle that contains cells genetic material in the form of DNA |
Selective Permeability | Membrane allows some substances to pass through while keeping others out. |
Phospholipid Bilayer | Two layers of phospholipids are arranged tail to tail. |
Transport Protein | Protein that moves substances or wastes through the plasma membrane. |
Fluid Mosaic Model | A plasma membrane with components constantly in motion sliding past one another within the lipid bilayer. |
Cytoplasm | Semifluid material inside the cell's plasma membrane |
Ribosome | Organelle that is the site of protein synthesis |
Nucleolus | The site of ribosome production within the nucleus of eukaryotic cells. |
Endoplasmic Reticulum | A highly folded membrane that is the site of protein and lipid synthesis (in eukaryotic cells) |
Golgi Apparatus | Flattened stack of tubular membranes that modify proteins and packages them for distribution outside the cell. |
Lysosome | A vesicle that contains digestive enzymes for the breakdown of excess or worn out cellular substances. |
Vacuole | A membrane-bound vessel for the temporary storage of materials. |
Centrioles | Organelles that occur in pairs and are important for cell division |
Mitochondria | A membrane-bound organelle that makes energy available to the rest of the cell. |
Cell Wall | A flexible barrier that provides support and protects the plant. |
Chloroplasts | A double-membrane organelle with thylakoids containing chlorophyl, where photosynthesis takes place. |
Cilia/Flagella | Projections from cell's surface that aid in locomotion and feeding, also used to sweep substances along surfaces |
Diffusion | Movement of particles of a substance from where they are many to where there are few. |
Dynamic Equilibrium | Continuous movement but no overall change. |
Facilitated Diffusion | Use transport proteins to move other ions and small molecules across the plasma membrane |
Osmosis | Diffusion of water across a selectively permeable membrane. |
Isotonic Solution | Cells in a solution that have the same concentration of water and solutes (=) |
Hypertonic Solution | Cells have a lower concentration of solute (more water outside the cell than inside) |
Active Transport | Energy requiring process by which substances move across the plasma membrane against a concentration gradient |
Endocytosis | Energy requiring process by which large substances from the outside environment can enter a cell |
Exocytosis | Energy requiring process by which a cell expels wastes and secretes substances at the plasmic membrane. |