AP Biology 6/7

2. The diffusion gradient of an ion, which is affected by both the concentration difference of an ion across a membrane and the ion's tendency to move relative to the membrane potential.
4. A membrane-bounded vesicle whose specialized function varies in different kinds of cells.
9. A non-membrane-enclosed region in a prokaryotic cell where its chromosome is located
10. A transmembrane protein that helps a certain substance or class of closely related substances to cross the membrane.
11. A type of intercellular junction between animal cells that prevents the leakage of material through the space between cells.

1. The disruption of a cell and separation of its parts by centrifugation at successively higher speeds.
3. An extracellular glycoprotein secreted by animal cells that helps them attach to the extracellular matrix.
5. A membrane-bound sac in or outside a cell.
6. The complex of DNA and proteins that makes up eukaryotic chromosomes. When the cell is not dividing, chromatin exists in its dispersed form. As a mass of very long thin fibers that are not visible with a light microscope.
7. The portion of the endoplasmic reticulum with ribosomes attached.
8. The diffusion of free water across a selectively permeable membrane.