Cell Transport and Membranes

Front

What does it mean that the cell membrane is selectively permeable?

Back

It means that certain things can enter while others cannot.

Front

What is facilitated diffusion?

Back

It is a process where special proteins help move particles across the cell membrane without the need for energy.

Front

What cellular structure controls what substances may enter or leave cells?

Back

The cell membrane.

Front

What term describes a substance that is 'water fearing'?

Back

Hydrophobic.

Front

What does it mean for a membrane to be selectively (or semi) permeable?

Back

It means that some molecules can cross the membrane while others cannot.

Front

What is the primary function of the cell membrane?

Back

To maintain homeostasis by regulating the entry and exit of substances.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not.

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane.

Front

What are transport proteins?

Back

Proteins that help move substances across the cell membrane.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the membrane's fluidity.