Functions of Proteins and Phospholipids

What does it mean for cell membranes to be selectively permeable?

Cell membranes can control which substances pass through them, allowing some molecules to enter while excluding others.

Why are non-polar molecules able to cross cell membranes by simple diffusion?

Non-polar molecules dissolve in the hydrophobic layer of the bilayer and can easily cross the membrane.

What types of molecules do channel proteins facilitate the diffusion of?

Channel proteins facilitate the diffusion of specific charged or polar particles.

What is the function of protein carriers in the cell membrane?

Protein carriers are involved in active transport and facilitated diffusion, transporting polar or charged molecules.

What role do some membrane proteins play in relation to hormones or neurotransmitters?

Some membrane proteins act as specific receptors for hormones or neurotransmitters.

What is ATP synthetase and where is it located?

ATP synthetase is an enzyme that is an intrinsic protein embedded in the cristae of mitochondria.