04 BIO B1 Transport Phenomena in
Biosystems A UPDATED SCRIPT 2026
PRACTICE SOLUTIONS GRADED A+
● Cell membrane is composed of. Answer: -a phospholipid bilayer
● transport protein. Answer: helps molecules enter or leave the cell
-gated ion channels (gates that open and close)
-carrier proteins (change shape to allow specific molecules to pass)
-aquaporin (allow water to diffuse through)
● marker protein. Answer: identify the cell
important in immunity and blood typing
● receptor protein. Answer: allows the cells to communicate
● concentration gradient. Answer: an area of high concentration to an
area of low concentration
● passive transport. Answer: high to low
no energy
-diffusion
Biosystems A UPDATED SCRIPT 2026
PRACTICE SOLUTIONS GRADED A+
● Cell membrane is composed of. Answer: -a phospholipid bilayer
● transport protein. Answer: helps molecules enter or leave the cell
-gated ion channels (gates that open and close)
-carrier proteins (change shape to allow specific molecules to pass)
-aquaporin (allow water to diffuse through)
● marker protein. Answer: identify the cell
important in immunity and blood typing
● receptor protein. Answer: allows the cells to communicate
● concentration gradient. Answer: an area of high concentration to an
area of low concentration
● passive transport. Answer: high to low
no energy
-diffusion
