MS: additional cards Flashcards
what happens when a plant cell is placed in a solution of higher water potential?
the cell sap has a lower water potential than the solution outside the cell, so water enters the cell by osmosis. the large central vacuole increases in size and pushes the contents of the cell against the cell wall. this pressure exerted against the cell wall is known as turgor pressure. the cell becomes turgid.
what happens when an animal cell is placed in a solution of higher water potential?
the cell has a lower water potential than the solution outside the cell, so water enters the cell by osmosis. the cell swells and may even burst, known as cell lysis.
what happens when a plant cell is placed in a solution of lower water potential?
the cell sap has a higher water potential than the solution outside the cell, so water leaves the cell by osmosis. the cytoplasm and cell membrane pull away from the cell wall; the cell is plasmolysed.
what happens when an animal cell is placed in a solution of lower water potential?
the cell has a higher water potential than the solution outside the cell, so water leaves the cell by osmosis. the cell shrinks and shrivels; little spikes may appear on the cell membrane: this is known as crenation.
define active transport
active transport: the movement of substances across a membrane from a region of lower concentration to a region of higher concentration against a concentration gradient through the use of energy (in the form of adenosine triphosphate, ATP) in the cell.
