Unformatted text preview: packaged in vesicles by the ER and later exported by the cell. 3. Many vacuoles store undigested nutrients. One type of vacuole, called a contractile vacuole, is found in some single-celled freshwater organisms. The contractile vacuole pumps out excess water that diffuses into the cell....
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- Spring '09
- ER Membrane, Dustin Lee, single-celled freshwater organisms