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CELL (Cytoplasm (Organelles (Smooth endoplasmic reticulum (Structure:…
CELL
Cytoplasm
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Organelles
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Ribosomes
Structure: dense particles consisting of two subunits, each composed of ribosomal RNA and protein; free or attached to rough ER
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Mitochondria
Structure: rodlike, double-membrane structures
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Centrioles
Structure:paired cylindrical bodies, each composed of nine triplets of microtubules
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Plasma Membrane Small MoleculesTransport:1) simple diffusion-moving down a concentration gradient; form area of greater concentration to area of lesser concentration until equilibrium is reached;2) facilitated diffusion-moving down concentration gradient, diffusing through plasma membrane by moving through a specific integral protein; 3) active transport- moving against concentrated gradient; 4) osmosis -diffusion of water through the lipid bilayer.Largest Molecules and Large Solid Particles Transport -Endocytosis-vesicle forms and take in whatever is outside the cell,three types: 1)Phagocytosis- "eating" the body's foreign substances; 2)Pinocytosis-unselective way of sampling the extracellular fluid; 3) Receptor-mediated endocytosis- extracellular substances bind to specific receptors on the cell membrane for transport into the cell. Exocytosis- movement of substances from cytoplasm to the outside of the cell:1) the molecule to be secreted migrates to the plasma membrane in a membrane-bound vesicle; 2) at the plasma membrane, proteins at the vesicle surface bind with t-snares; 3) the vesicle and plasma membrane fuse and a pore opens up; 4) and vesicle contents are released to the cell exterior.
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