Cell Membrane/Transport Flashcard25/26

Front

Why is the cell membrane described as a fluid mosaic?

Back

Its components, like lipids and proteins, move freely within the layer.

Front

What type of molecules can pass through the cell membrane without the help of transport proteins?

Back

Small, nonpolar molecules like oxygen and carbon dioxide

Front

Why is the cell membrane described as a bilayer?

Back

Two layers of phospholipids

Front

Which structure serves as the cell’s boundary from its environment? - thin, flexible barrier around a cell; regulates what enters and leaves the cell

Back

cell membrane

Front

Diffusion is the movement of molecules from

Back

an area of high concentration to an area of low concentration.

Front

When the concentration of molecules on both sides of a membrane are the same, the solutions are _____________.

Back

isotonic

Front

When comparing two solutions, the solution with the greater concentration of solutes (less water) is called?

Back

hypertonic

Front

Why does diffusion occur?

Back

molecules constantly move and collide with each other.

Front

What happens to an animal cell in fresh water (hypotonic solution)?

Back

Water will move into the cell (swell/burst).

Front

The movement of specific molecules across cell membranes through a protein channel that go from high concentration to low and do not require energy is called ______________________________.

Back

Facilitated transport