Membranes 2

Front

What are aquaporins?

Back

Aquaporins are integral membrane proteins that facilitate the transport of water across cell membranes, increasing membrane permeability to water.

Front

How do cholesterol molecules affect membrane fluidity?

Back

Cholesterol molecules help to maintain membrane fluidity by preventing the fatty acid chains of phospholipids from packing too closely together, thus allowing for flexibility.

Front

What are peripheral membrane proteins?

Back

Peripheral membrane proteins are proteins that are loosely attached to the exterior or interior surfaces of membranes and can be easily removed without disrupting the membrane structure.

Front

What is a transmembrane protein?

Back

Transmembrane proteins are integral membrane proteins that span the entire lipid bilayer, with portions exposed on both the extracellular and intracellular sides of the membrane.

Front

What is the role of ion channels in membranes?

Back

Ion channels are proteins that form pores in the membrane, allowing specific ions to pass through, which is crucial for processes like nerve impulse transmission.

Front

What characterizes hydrophobic amino acids?

Back

Hydrophobic amino acids have nonpolar side chains that do not interact favorably with water, making them likely to be found in the interior of membrane proteins.

Front

What is the function of the LDL receptor?

Back

The LDL receptor is an integral membrane protein that binds low-density lipoprotein (LDL) particles, facilitating their uptake into cells.

Front

How do integral membrane proteins differ from peripheral membrane proteins?

Back

Integral membrane proteins are embedded within the lipid bilayer and often span the membrane, while peripheral membrane proteins are attached to the surface and do not penetrate the lipid bilayer.

Front

What is membrane permeability?

Back

Membrane permeability refers to the ability of substances to pass through a membrane, which can be influenced by factors such as protein channels and lipid composition.

Front

What is the significance of membrane fluidity?

Back

Membrane fluidity is important for the proper functioning of membranes, allowing for the movement of proteins and lipids, and facilitating cell signaling and transport.