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tour of cell

Light Microscope (LM) visible light is passed through a specimen and then through glass lenses. Lenses refract (bend) the light, so that the image is magnified. 1,000 times the size of the actual specimen
Magnification The ratio of an object's image size to it real size
Resolution The measure of the clarity of the image, or the minimum distance of two distinguishable points
Contrast visible differences in parts of the sample
Scanning electron microscope (SEM) focus a beam of electrons onto the surface of a specimen, providing images that look 3-D
Transmission electron microscope (TEM) focus a beam of electrons through a specimen, used mainly to study the internal structure of cells
The basic structural and functional unit of every organism. two type of cells Prokaryotic or Eukaryotic
Only organisms of the domains Bacteria and Archaea Prokaryotic
Protists, fungi, animals, and plants Eukaryotic cells
Basic feature of all cells Plasma membrane (cell membrane) Semifluid substance called cytosol Chromosomes ( carry genes) Ribosomes (makes proteins)
Prokaryotic Cells No nucleus envelope DNA in an unbound region called nucleoid No membrane-bound organelles Cytoplasm bound by the plasma membrane
Eukaryotic Cells DNA in nucleus that is bounded by a membranous nuclear envelope Larger and complex Membrane-bound organelles Cytoplasm in the region between the plasma membrane and nucleus
Nucleus contains most of the cell's genes and is usually the most conspicuous organelles, The nuclear envelope encloses the nucleus, separating it from the cytoplasm, nuclear membrane is a double membrane, each membrane consists of a lipid bilayer
Pores regulate the entry and exit of molecules from the nucleus
Microvilli projections that increase the cells surface area
Cytoskeleton reinforces cells shape; function in cell movement components are made of protein, includes; Microfilaments, Intermediate filaments,Microtubules
Flagellum motility structure present in some animal sells, composed of a cluster of microtubules within an extension of the plasma membrane
Mitochondrion organelle where cellular respiration occurs and most ATP is generated
Lysosome digestive organelle where macromolecules are hydrolyzed
Golgi apparatus organelle active in synthesis, modification, sorting and secretion of cell products
Ribosomes small brown dots complexes that makes proteins, free in cytosol or bound to rough ER or nuclear envelope. Made up of RNA and proteins
Plasma membrane membrane enclosing the cell
Cell wall outer layer that maintains cells shape and protects cell from mechanical damage; made of cellulose, other polysaccharides, and protein
Plasmodesmata cytoplasmic channels through cell walls that connect the cytoplasms of adjacent cells
Central Vacuole prominent organelle in older plants cells; function include storage, breakdown of waste products, hydrolysis of macromolecules. enlargement of vacuole is major mechanism of plant growth
Created by: breawnsmith
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