Chapter 8.3 Cell Transport Flashcard

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process by which molecules that cannot cross the cell membrane pass through special protein channels without the use of energy.

Front

What types of molecules typically undergo facilitated diffusion?

Back

Molecules that are polar or charged and cannot easily cross the lipid bilayer, such as glucose and ions.

Front

What is the primary function of ATP in active transport?

Back

ATP provides the energy required to move molecules against their concentration gradient through protein pumps.

Front

What is the difference between passive transport and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What is osmotic pressure?

Back

Osmotic pressure is the pressure required to prevent the flow of water across a semipermeable membrane due to solute concentration differences.

Tags

NGSS.HS-LS1-3

Front

Why do plant cells not typically experience osmotic pressure problems?

Back

Plant cells have a rigid cell wall that provides structural support and prevents excessive swelling from osmotic pressure.

Front

What is the role of protein channels in facilitated diffusion?

Back

Protein channels provide a pathway for specific molecules to pass through the cell membrane, allowing for selective transport.

Front

Does facilitated diffusion require cellular energy?

Back

No, facilitated diffusion does not require the use of the cell's energy.

Front

What happens to solute particles in water?

Back

Solute particles move constantly and collide with one another, leading to a tendency to spread out randomly.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules.

Tags

NGSS.HS-LS2-5