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Chapter 3: 3.1

Mrs. Sylvia Ch3: 3.1 Microscopes and Cells

QuestionAnswer
Microscope Instrument that produces magnified images of tiny structures
Anton van Leeuwenhoek Created an instrument that could magnify images of very small objects
Lens any transparent material that refracts or bends light
Convex lens Lens used in microscopes that causes light to come together, magnifying an image
Cells smallest working unit of living things.
Cell Theory All living things are composed of cells; cells are the smallest working units of living things; all cells come from preexisting cells by cell division
Compound light microscope Contains more than one lens; magnifies an image 1000 times
Electron microscope Uses a beam of electrons instead of light; magnifies 1000 times more than the compound; used to study only nonliving specimens
Transmission electron microscope (TEM) Magnifies the internal structure
Scanning electron microscope (SEM) Magnifies sample's surface
Scanning probe microscope Traces the surface with a tiny tip known as probe; provides the maximum magnification
Robert Hooke Only plants had cells
Theodor Schwann Animals also were made of cells
Robert Brown Discovered the nucleus of the cells
Matthias Schleiden Cell nucleus involved in cell reproduction
Rudolf Virchow Animals and plants cells are produced only by division of existing cells
Created by: Mrs. Sylvia
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