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membrane lets only some materials through. In a cell, small nonpolar molecules can usually cross the mem-brane by themselves. Small polar molecules can be carried by proteins. Large molecules can be moved in vesicles. Name another semipermeable object. What can pass through it? What cannot? Chemical signals are transmitted across the cell membrane. Health Level Seven International - Homepage | HL7 International ... Todo 1. semipermeable; allows certain substances to pass through nucleus 2. controls activities of the cell plasma membrane 3. storage structure organism 4. thick fluid between plasma membrane and nucleus cell wall 5. functional plant or animal cytoplasm 6. fibrous material giving support to the plant nucleolus 7. produces ribosomal nucleic acid (RNA) vacuole