flash cards

7.3 Biology

Question Answer
Passive Transport The movement of materials across the cell membrane without using cellular energy.
Active Transport The movement of materials against a concentration difference
Diffusion Is the process by which particles move from an area of high to low concentration
Facilitated Diffusion Is the process by which molecules that cannot directly diffuse across the membrane pass through special protein channels
Osmosis Is the facilitated diffusion of water through a selectively permeable membrane
Aquaporins Are water channel proteins that allow water to pass through cell membranes
Hypertonic Solutions have a lower concentration of solute compared to another solution
Osmotic pressure Is the force caused by the net movement of water by osmosis.
Which of the following must be true for diffusion to occur? Energy must be available
Which term refers to the condition that exists when no net change in concentration results from diffusion? Osmosis
Air has a higher concentration of oxygen molecules than does the cytoplasm of your lung cells. Where in your lungs will there be a net increase of oxygen? Inside of the lung cells
Which of the following statements tells how facilitated diffusion differs from simple diffusion? Particles move within channel proteins that pass through cell membranes
How does ATP enable Transport proteins to move ions across a cell membrane? They act like pumps and change its shape.
What are the proteins in active Transport called? Carrier proteins
Endocytocis Is the process of taking material into the cell by means of infoldings, or pockets of the cell membrane
Phagocytosis Is a type of endocytosis in which extensions of a cytoplasm surround a particle and package it within a food vacuole
Exocytosis The membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell

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