Cell Membranes/Transport

Front

Something is ___________ ____________ when some molecules can cross the membrane while others cannot.

Back

Selectively (or Semi) Permeable

Front

Osmosis is the movement of _____ across a membrane.

Back

water

Front

Passive transport requires no __________.

Back

energy

Front

What is the hydrophobic region of the cell membrane?

Back

The part of the membrane that repels water, typically made of fatty acids.

Front

In what direction do particles naturally diffuse?

Back

Down the concentration gradient

Front

What is the function of the cell membrane?

Back

To protect the cell and control what enters and leaves.

Front

Define diffusion.

Back

The movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is active transport?

Back

The movement of molecules against the concentration gradient, requiring energy.

Front

What role do proteins play in the cell membrane?

Back

They assist in transporting substances across the membrane.

Front

What is a concentration gradient?

Back

A difference in the concentration of a substance across a space.