Explain how cholesterol helps maintain the plasma membrane's fluid nature

Distinguish molecules that can diffuse through a lipid bilayer from those that must be transported. Describe the transport of small molecules by carrier proteins, and contrast ion channels and pores. Explain how ion gradients can drive active transport across membranes.

List 2 functions of peripheral membrane proteins

Explain passive transport and active transport across the cell membrane.

The intracellular salt content of a red blood cell is about 150 mM. The cell is put in a 500 mM salt beaker. (a) Describe what will happen to the cell in terms of osmosis if the cell membrane is permeable to water but not to ions. (b) Which direction would solutes diff use if the membrane was permeable to ions: into or out of the cell?

Define cell membrane transport and membrane selectivity.  Explain why the plasma membrane is selectively permeable.  List and discuss which molecules can and cannot cross the membrane and explain why. Discuss why some molecules can cross directly while others require transport proteins.

A red blood cell's intracellular salt concentration is around 150 mM. The cell is placed in a 500 mM sodium chloride beaker. (a) Explain how osmosis will affect the cell if the cell membrane is permeable to water but not to ions. (b) If the membrane were permeable to ions, which direction would solutes diffuse in: into or out of the cell?

One of the symptoms of diabetes mellitus (sugar diabetes ) is extreme thirst . What brings about this feeling of thirst? Explain in terms of osmosis.

Describe what gap junction are, emphasizing on how they are different two other cellular points of contact, their protein components and cellular function. Describe the three main sources of membrane fluidity.  Describe in detail what proteoglycans are, including their hygroscopicity and biological roles.

Explain the difference between active transport across the cell membrane and passive transport.