Chapter 5 - Cells in their environment Flashcards
What is the concentration gradient?
A difference in concentration of a substance between two areas.
What is a selectively permeable membrane?
A membrane that only allows certain substances pass through it.
What is osmosis?
The diffusion of water across a selectively permeable membrane from an area of higher water concentration (or low solute concentration) to an area of lower water concentration (or high solute concentration), osmosis MUST occur through a selectively permeable membrane.
What is turgor pressure?
The outward pressure that is exerted on a plant cell wall by the cell contents, when water is taken in by osmosis.
What is endocytosis?
The process by which a cell moves large amounts of material, or non-dissolved particles, into it’s cytoplasm from the outside environment.
What is phagocytosis
A type of endocytosis in which a cell uses pseudopods to move non-dissolved particles into it’s cytoplasm from the outside environment.
What is exocytosis?
The process by which large amounts of material, or large non-dissolved particles, are moved from a cell’s cytoplasm to the outside environment.
What is a permeable membrane?
A membrane that lets things pass through it.
What is a non-permeable membrane?
A membrane that lets nothing pass through it.
What is the job of the cell membrane?
To let food and water into the cell when needed, and to expel any unwanted materials.
