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Chapter 3

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Question
Answer
Cell Membrane   Composed of phospholipid bilayer,and proteins, receptors, pores, channels, and carriers, enzymes, CAMS, and self-markers.  
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Cytoplasm   Contains Cytosol and organelles  
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Endoplasmic Reticulum (ER)   Ribbon candied shape closest to nuclear envelope. Provides a tubular transport system for molecules. Participates in the synthesis of protein and lipids.  
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Ribosomes   Produce protein. Composed of protein and RNA  
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Golgi Apparatus   Modifies, packages, and delivers proteins.  
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Vesicles   Membranous sacs that store substances.  
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Mitochondira   Generate energy from food molecules.  
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Lysosomes   Sacs containing enzymes capable of digesting worn cellular parts.  
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Peroxisomes   Contain enzymes called perosidases, important in the breakdown of many organic molecules.  
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Centrosomes   Helps distribute chromosomes to new cells during cell division, initiates formation of cilia.  
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Microfilaments and Microtubules   Support cytoplasm, help move substances and organelles within the cytoplasm.  
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Nuclear envelope   Double membrane controls passage of materials between nucleus and cytoplasm.  
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Nucleolus   Composed of protein and RNA. Site of ribosome formation.  
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Chromatin   Fibers composed of protein and DNA. Carries info for synthesizing proteins  
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Simple Diffusion   Moving from hign concentration to low concentration.  
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Facilitated Diffusion   Movement across a membrane with the help of channel or carrier molecule.  
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Osmosis   Movement of water from high concentration to low. Water moves toward a higher concentration of solutes.  
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Filtration   Smaller molecules are forced through porous membranes. Hydrostatic pressure.  
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Osmosis Pressure   Ability of osmosis to generate enough pressure to move volume of water. Pressure increases as concentration of nonpermeable solutes increases.  
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Isotonic   Equal pressure.  
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Hypertonic   Higher osmotic pressure than surrounding body fluids. Water leaves cell.  
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Hypotonic   Lower osmotic pressure than surrounding body fluids. Water enters cell.  
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Active Transport   Carrier molecules transport substances across membrane from low to high concentrations. Sodium ions, potassium ions  
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Sodium-Potassium Pump   Creates balance by pumping 3 sodium out and 2 potassium into cell. Requires energy and makes energy.  
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Endocytosis   When a molecule that is too big to pass through a membrane enters by a vesicle.  
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Pinocytosis   Membrane engulfs liquid  
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Phagocytosis   Membrane engulfs solid  
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Receptor-mediated   Receptor protein molecules that bring in specific types of particles.  
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Exocytosis   Vesicles form around waste and fuse with membrane to release contents outside cell.  
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Interphase   Growth period of cell.G phase grows and synthesises things other than DNA. S Phase cell replicates DNA.  
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Mitosis   Produces 2 daughters cells from one mother cell.  
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Prophase   Chromosomes form, envelope disappears.  
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Metaphase   Chromosomes align midway between centrioles.  
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Anaphase   Chromosomes separate and move to opposite centrioles.  
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Telophase   Chromatin and nuclear enevelope forms.  
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Apoptosis   cell death  
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Stem cells   Can divide to form 2 new stem cells.Or 1 stem cell and 1 progenitor cell.  
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Totipotent   Stem cell that can become every cell type.  
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Pluripotent   Restricted # of cells  
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Progenitor cells   committed to certain functions. Can divide to become any # of restricted cells.  
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