ANSWERS TO CELL PROBLEMS 6. A, plant; B, fungus; C, protist; D, bacterium; E, animal 7. cell wall 8. plastids 9. nucleus 10. The secretion of proteins occurs through the function of the endomembrane trafficking system--ER to Golgi to plasma membrane--with vesicles moving proteins between components. The vesicle movement is powered and directed by motor proteins moving along microfilaments. 11. cytosol, plasma membrane, ER membrane, ER lumen, golgi membrane, golgi lumen, lysosome, other vesicle (peroxisome, lipid body), nuclear envelope, nucleoplasm, extracellular space (cell wall), tonoplast, vaculolar
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