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Chapter 7 Vocabulary

TermDefinition
Cell Basic unit of all organisms; all living things are composed of cells.
Cell Theory Made up of three ideas: (1) All organisms are composed of one or more cells (2) The cell is the basic unit of structure and organization of organisms (3) All cells come from preexisting cells.
Compound Light Microscope Instrument that uses light and a series of lenses to magnify objects in steps.
Electron Microscope Instrument that uses a beam of electrons to magnify structures.
Eukaryote Unicellular or multicellular organisms composed of eukaryotic cells.
Nucleus Positively charged center of an atom.
Organelle Membrane-bound structures with particular functions within eukaryotic cells.
Prokaryote Unicellular organisms composed of prokaryotic cells.
Fluid Mosaic Model Structural model of the plasma membrane.
Phospholipid Lipids with an attached phosphate group.
Plasma Membrane Flexible boundary between the cell and its environment.
Selective Permeability Feature of the plasma membrane that maintains homeostasis.
Transport Proteins Proteins that span the plasma membrane.
Cell Wall Fairly rigid structure located outside the plasma membrane.
Chlorophyll Light-absorbing pigment required for photosynthesis.
Chloroplast Chlorophyll containing organelles.
Chormatin Long strands of DNA found in the eukaryotic nucleus.
Cilia Short, hair-like projections composed of pairs of microtubles.
Cytoplasm Clear fluid in the cells that is the site of numerous chemical reactions.
Cytoskeleton Cellular framework found within the cytoplasm.
Endoplasmic Reticulum The site of cellular chemical reactions.
Fiagella Long projections composed of microtubules.
Golgi Appartatus Organelle in eukaryotic cells with a system of flattened tubular membranes.
Lysosome Organelles that contain digestive enzymes.
Microfilament Thin, solid protein fibers that provide structural support.
Microtubule Thin, hollow cylinders made of protein.
Mitochondria Eukarytoic membrane-bound organelles that transform energy stored in food molecules.
Nucleolus Organelle in eukaryotic cell nucleus that produces ribosomes.
Plastid Group of plant organelles that are used for the storage of starches, lipids, or pigments.
Ribosome Nonmembrane-bound organelles in the nucleus where proteins are assembled.
Vacuole Membrane-bound space in the cytoplasm of cells used for the temporary storage of minerals.
Created by: Emilee West
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