The Cell Membrane

Question 1

the plasma membrane is made of a ___________ bilayer

Answer 1

phospholipid

Question 2

the plasma membrane allows cells to maintain a constant ______ _______

Answer 2

internal environment

Question 3

the plasma membrane is a ________ permeable barrier

Answer 3

selectively

Question 4

the plasma membrane controls ______ ______

Answer 4

chemical traffic

Question 5

major components of the plasma membrane

Answer 5

phospholipids, cholesterol, and proteins

Question 6

cells are open systems, meaning they can exchange ________ and _______

Answer 6

matter; heat energy

Question 7

_______ ________ ________ have hydrophobic & hydrophilic regions or domains; some extend across the lipid bilayer, others are partially embedded

Answer 7

integral membrane proteins

Question 8

________ ________ _______ lack exposed hydrophobic groups & do not penetrate the bilayer

Answer 8

peripheral membrane proteins

Question 9

_________ is the ability to maintain relative stability & functions as changes occur in the internal or external environment

Answer 9

homeostasis