Cell Transport and Membranes

Front

What are the two types of passive transport?

Back

Osmosis and diffusion.

Front

What does it mean for a membrane to be selectively permeable?

Back

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

Front

In which direction do molecules typically diffuse?

Back

From an area of higher concentration to an area of lower concentration.

Front

What are the two parts of a phospholipid?

Back

Hydrophilic head and hydrophobic tail.

Front

What role does cholesterol play in the cell membrane?

Back

Cholesterol strengthens and stabilizes the cell membrane.

Front

Define osmosis.

Back

Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is the function of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and support.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport requires energy to move molecules against their concentration gradient.

Front

What is a concentration gradient?

Back

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