Studied by 44 peopleActive Transport
Process that moves materials across a cell membrane against a concentration gradient
Requires energy
Passive Transport
Follows the concentration gradient (materials move from an area of high concentration to low concentration)
Does NOT require energy
Concentration Gradient
When there is a difference in concentration of molecules on either side of a cell membrane
3 types of Passive Transport
Diffusion
Facilitated diffusion
Osmosis
Diffusion
Process in which molecules move from areas of higher concentration to areas of lower concentration
Facilitated Diffusion
Movement of molecules across a membrane by carrier proteins
Does not require energy
Osmosis
The diffusion of water molecules through a selectively permeable membrane. Water will move from areas of high concentration of water to areas of lower concentration.
Osmotic Pressure
the force exerted to move water through a membrane
Turgor
the rigidity or stiffness of plants due to the water present in their cells
What is A?
Phospholipid bilayer
What is B?
Integral protein
What is F?
Fatty acid tails
What is G?
Phosphate head
What is H?
Peripheral Protein
What is I?
Cholesterol
What is C?
Glycoprotein
What is E?
Glycolipids
What does G do?
Attracts water
What does I do?
Helps maintain flexability
What does C do?
Involved in cell-to-cell recognition
What does F do?
Repels water
What does B do?
Helps transport certain materials across the cell membrane
Hypotonic
Bursts
isotonic
stays the same
Hypertonic
Shrink
Membrane Pumps
Protein pumps that transport calcium, sodium, and potassium ions across a membrane
Endocytosis
Taking materials into the cell by pockets and infoldings of the cell membrane
Exocytosis
Contents of the cell are forced out by the pocket membrane fusing with the cell membrane
Examples of endocytosis
Phagocytosis and Pinocytosis
Phagocytosis
Large particles are taken in
Pinocytosis
Cells take up liquid from the surrounding environment
Note 
Flashcard (50)