Biology test 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Plasma membrane | outer boundary of the cell, 5-10 nm thick
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| Cell wall | Mostly mechanical/protective role--provides support (strength and rigidity) to cell, and some filtering capacity. Found in plants, fungi, bacteria and archaea
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| Cell membrane | In all cells; semi-permeable barrier that contains the cell cytoplasm, controls movement of substances in and out of cell.
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| Compartmentalization | Membranes form continuous sheets that enclose specific intracellular compartments -- allowing specialized activities to proceed w/o extracellular interference
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| Scaffolding (for biochemical activities) | membranes provide a framework that organizes enzymes for effective interaction-- b/c membranes are compartments themselves, as long as reactants are in solution, positions cant be stabilized and interactions depend on random collisions
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| Selectively permeable barrier | membranes allow regulated exchange of substances between compartments-- gated barrier that promotes movement of select elements into and out of the cell
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| Transporting solutes | membrane proteins facilitate the movement of substances between compartments-- physically transports the substances from low concentration of solute to high concentration of solutes
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| responding to external signals: membra e |
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To hide a column, click on the column name.
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
snphillips1
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