structures and functions of the plasma membrane

Question 1

physical barrier

Answer 1

establishes a flexible boundary, protects cellular contents, and supports cell structure

phospholipid bilayer separates substances inside and outside the cell

Question 2

selectively permeable boundary

Answer 2

regulates entry and exit of ions, nutrients, and waste molecules through the plasma membrane

Question 3

electrochemical gradients

Answer 3

establishes and maintains an electrical charge difference across the membrane

Question 4

communication

Answer 4

contains receptors that recognize and respond to molecular signals