Membrane Test Flashcards
What types of molecules have “heads” and “tails” and are found in the cell membrane
Phospholipids
Cell membranes are…permeable because it allows the passage of some dilutes and not others
Selectively
As a result of…, the concentration of many types of substances eventually becomes … On both sides of a membrane
Diffusion
Equal
Diffusion takes place from an area of … Concentration to an area that of … Concentration
High
Low
Dispersal of ink in a beaker of water is an example of …
Diffusion
Channels that utilize facilitated diffusion work in … Directions
Both
Sugar molecules can enter cells through the process of … But … Gets through the membrane by passive transport
Active transport
Glucose
True or false
Facilitated diffusion works against a concentration gradient
False
True or false
Electrical or chemical signals may control the movement of ions across cell membranes
True
What kind of transport does not use energy
Passive
What types of energy use energy
Active
What types of molecules enter the cell through active transport
Ions, polar, and large
Define osmosis
Diffusion of H2O
Sodium potassium pumps … Into the cell and… Out of the cell
2K+
3Na+
What is exocytosis
Cell releasing material
