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Science

chapter four quiz 1

QuestionAnswer
how does a light microsope work? passing visible light through a specimen
what to glass lenses do to magnify the image? refract light
what is magnification? the increase in apparent size of an object
as magnification increases, resolution _______ decreases
what is resolution? the measure of the clarity of an image; the ability of an optical instrument to show two close objects as seperate
what can a light microscope not show pretaining to cells? internal structure
name the parts of a microscope ocular, nosepiece, objectives, diaphram, coarse adjustment, fine adjustment, light source
what is the function of the ocular and objectives? cantain lenses that magnify the image
what is the function of the coarse and fine adjutments? focuses, improves resolution
what is the function of the diaphragm? regualtes amount of light passing through a specimen
what is the function of the stage clips? holds slide in palce
what is the function of the nosepiece? rotates to change objectives
who discovers and names the cell? Robert Hooke
Who sees first living cells? Anton von Leeuwenhoek
who discovers the nucleus? Robert Brown
Who finds out that all plants are made of cells? Matthias Schleiden
Who finds out that all animals are made of cells? Theodore Schwann
Who finds out that every cell originates from another cell? Rudolf Virchow
What is cell theory part 1? all living things are made of cells
What is cell theory part 2? the cell is the functional unit of life
What is cell theory part 3? cells only come from other cells by cell division
Who built the first electron microscope? Ernst Ruska (russian)
What is difference between electron and light microscopes? electron is beam of elctrons, light is beam of white light
how many times can an electron microscope magnify? 2 million
what are 2 problems with electron microscopes? specimens must be in a vacuum, can't view living cells
explain how a SEM works beam scans sirface of specimen coated with metal; when beam hits metal, metal emits electrons
what is the problem with transmission electron microscopes? specimen must be sliced very thin so the beam can pass through it
Created by: nickjosephh
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