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MPS Biology Ch 7
| Term | Definition |
|---|---|
| Nucleus 7.1 | central organelle that contains the cell's genetic material in the form of DNA |
| Organelle 7.1 | specialized structure that carries out specific cell functions |
| Cell Theory 7.1 | One fundamental ideal of modern biology and includes 3 principles. 1. living = 1 or more cells 2. all living things are composed of cells which are basic unit of structure and organization of life 3. cells arise from pre-existing cells |
| Prokaryotic Cell 7.1 | cells without a nucleus or other membrane-bound organelles |
| Plasma Membrane | special boundary that helps control what enters and leaves the cell |
| Cell 7.1 | basic structural and functional unit of all living things |
| Eukaryotic Cell 7.1 | contains a nucleus and other organelles that are bound by membrane. |
| Transport Proteins 7.2 | protein that moves substances or wastes through the plasma membrane |
| Selectively Permeability | property of the plasma membrane that allows it to control movement of substances into or out of the cell |
| Phospholipid bilayer 7.2 | plasma membrane layers composed of phospholipid molecules arranged with polar heads facing the outside and nonpolar tails facing the inside |
| Fluid Mosaic Model 7.2 | a plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer |
| Golgi Apparatus 7.3 | Flattened stack of tubular membranes that modifies, sorts, and packages proteins into vesicles and transports them to other organelles or out of the cell |
| Cell Wall 7.3 | In plants, the rigid barrier that surrounds the outside of the plasma membrane, is made of cellulose, and provides support and protection to the call |
| Centriole 7.3 | Organelle that plays a role in cell division and is made of microtubules |
| Chloroplast 7.3 | double membrane organelle that captures light energy and converts it to chemical energy through photosynthesis |
| Cilium 7.3 | short, hair-like projection that functions in cell movement |
| Cytoplasm 7.3 | semi-fluid material inside the cell's plasma membrane |
| Cytoskeleton 7.3 | supporting network of protein fibers that provide a framework for the cell within the cytoplasm |
| Endoplasmic Reticulum 7.3 | highly folded membrane system in eukaryotic cells that is the site for protein and lipid synthesis |
| Flagellum 7.3 | long, tail-like projection with a whiplike motion that helps a cell move through a watery environment |
| Lysosome 7.3 | vesicle that uses enzymes to digest excess or worn-out cellular substances |
| Mitochondrion 7.3 | membrane-bound organelle that converts fuel into energy that is available to the rest of the cell |
| Nucleolus 7.3 | the site of ribosome production within the nucleus of the eukaryotic cells |
| Ribosome 7.3 | simple cell organelle that helps manufacture proteins |
| Vacuole 7.3 | membrane-bound vesicle for temporary storage of materials such as food, enzymes and wastes |
| Osmosis 7.4 | diffusion of water across a selectively permeable membrane |
| Dynamic Equilibrium 7.4 | condition of continuous, random movement of particles but no overall change in concentration of materials |
| Facilitated Diffusion 7.4 | passive transport of ions and small molecules across the plasma membrane by transport proteins |
| Hypertonic Solution 7.4 | a solution that has a higher concentration of a solute outside than inside a cell, causing water to leave the call by osmosis |
| Hypotonic Solution 7.4 | a solution that has a lower concentration of solute outside than inside the cell, causing water to flow into the cell by osmosis |
| Endocytosis 7.4 | energy-requiring process by which large substances from the outside environment can enter a cell |
| Diffusion 7.4 | net movement of particles from an area of higher concentration to an area of lower concentration |
| Isotonic Solution 7.4 | A solution with the same concentration of water and solutes as inside a cell, resulting in the cell retaining its normal shape because there is no net movement of water |
| Exocytosis 7.4 | energy-requiring process by which a cell expels wastes and secretes substances at the plasma membrane |
| Active Transport 7.4 | energy-requiring process by which substances move across the plasma membrane against a concentration gradient. |