Cells and Transport Test Review Solutions and Explanations

Focus on understanding the movement of molecules across biological membranes by applying the principles of diffusion, osmosis, and active transport. Identifying the factors that influence these processes will help you grasp how substances enter and exit living organisms.

In questions related to diffusion, ensure you recognize the concentration gradients and how they drive passive movement of molecules. This basic concept is central to many physiological processes such as gas exchange in the lungs and nutrient absorption in the intestines.

When dealing with active processes, pay close attention to the energy requirements involved in transporting substances against their gradients. The use of ATP in processes like endocytosis and exocytosis is key to understanding cellular function.