Structure and Function
What the cell membrane is mostly composed of
What are phospholipids
Diffusion happens anytime there is a difference in concentration in one place compared to another. This is called what?
What is concentration gradient
During passive diffusion, energy is what
What is not required
Active transport requires energy in the form of what
What is ATP
Substance in which a solute is dissolved
What is solvent
Characteristic of the membrane that allows only certain materials to go into and out of cell
What is selective permeability
During diffusion, molecules move from a _____ concentration to a ______ concentration
What is high to low concentration
Opens and provides the "help" to get molecules across the membrane during facilitated diffusion
What are integral proteins (or transport, or membrane-spanning proteins).
What is low to high concentration (or against the concentration gradient)
If a cell is placed in a hypertonic solution this will happen.
The portion of the cell membrane that allows large molecules and ions to pass through
What are integral proteins
Diffusion continues until the concentration is equal in the space.
What is equilibrium
If a cell is placed in distilled water, it is in a ____________________ solution and the cell will _____________.
What is hypotonic, and swell
This kind of proteins to move molecules through active transport
What are integral proteins
When cells shrink and shrivel
What is crenation (lose water due to hypertonic outside conditions)
Term referring to cells maintaining a stable environment
What is homeostasis
The movement of water molecules across a cell membrane
What is osmosis
This is why is it a very bad idea to drink sea-water if you are shipwrecked.
The reason energy is needed for active transport to occur.
This is why plant cells will never burst in a hypotonic solution.
What is their cell walls
Structure that allows the membrane to maintain its fluidity in both warmer and cooler conditions
What is cholesterol
When water moves during osmosis, it goes from the ________________ solution (or side) to the ________________solution (or side).
What is the hypotonic to hypertonic
(or from high to low concentration of water)
An example of a molecule your cells need that diffuses through an integral protein.
What is glucose, Na+ ions, K+ ions, enzymes, hormones, etc.
What is the process of releasing things out of cells and the process of taking substances into cells
What is endocytosis and exocytosis (or bulk transport)
Cell body shrinks and pulls away from the cell wall
What is plasmolysis