Which model best describes the structure of the plasma membrane?

A fluid-mosaic of a phospholipid bilayer with embedded proteins

Why does the plasma membrane block most ions from crossing the bilayer directly?

The hydrophobic core repels charged particles

Facilitated diffusion of glucose down its gradient

It forms a hydrophilic pore for specific ions or molecules to pass through

Water enters the cell and it may burst

Lower (more negative) water potential

Three sodium out, two potassium in

It moves more positive ions out than in, making the inside more negative

A curve that rises and then plateaus

To buffer membrane fluidity across a range of temperatures

13questions. Pick an answer and you'll see why right away.

Which model best describes the structure of the plasma membrane?
Which substance crosses the phospholipid bilayer most easily by simple diffusion?
Why does the plasma membrane block most ions from crossing the bilayer directly?
Which process is an example of passive transport?
What is the role of a channel protein in facilitated diffusion?
A red blood cell is placed in a hypotonic solution. What happens?
Using the equation psi equals solute potential plus pressure potential, what is the water potential of a cell with a solute potential of $-0.7$ bars and a pressure potential of $0.2$ bars?
Water moves across a membrane toward the region of...
How many ions does the sodium-potassium pump move per ATP, and in which directions?
Why does the sodium-potassium pump help create an electrochemical gradient?
On a graph of transport rate against solute concentration, what indicates facilitated diffusion rather than simple diffusion?
Which process moves a large particle into a cell within a membrane vesicle?
What is the function of cholesterol in an animal cell membrane?