How is water transported across the membrane? What are the two types of transport proteins? Describe how they function. Controlling what enters and leaves the cell in an important function of the nucleus vesicle plasma membrane Golgi apparatus. During diffusion, substances move from an area of _____ concentration to an area of _____ - concentration. Higher, lower lower, higher higher, equal Solution 2. During diffusion substances move from high concentration to low concentration. It is passive process and substances move along the Concentration gradient 1. Plasma membrane controls in and out of the molecules due to its selective nature. So plasma membrane is selective permiable 5. Plasma membrane contain two types of transport proteins. They are Passive transport proteins, that include carriers and channels. They transport substances in passive manner, without expending ATP. Active transporters, that transport substances by using ATP 4. Water transport across the Plasma membrane by a special type of protein called Aquaporins..