Exploring Passive Transport and Diffusion Mechanisms

What is a key characteristic of simple diffusion?

• It requires energy.

• It uses special membrane proteins.

• It does not require special membrane proteins.

• It only occurs in water.

What type of transport is nonspecific facilitated diffusion?

• Active transport

• Endocytosis

• Passive transport

• Osmosis

What role do permeases play in nonspecific facilitated diffusion?

• They provide energy for transport.

• They allow a wide range of molecules to pass through.

• They only allow water molecules to pass.

• They block all molecules from passing through.

What is a key feature of specific facilitated diffusion?

• It allows any molecule to pass through.

• It does not require membrane proteins.

• It requires energy.

• It only allows specific molecules to pass through.

What happens if a molecule is not recognized in specific facilitated diffusion?

• The molecule is transported actively.

• The channel opens anyway.

• The channel remains closed.

• The molecule is broken down.

What is osmosis?

• Movement of solutes across a membrane.

• Active transport of water molecules.

• Facilitated diffusion of solutes.

• Passive diffusion of water molecules.

How does water typically move across a membrane?

• From low to high concentration areas.

• From high to low concentration areas.

• Only through active transport.

• It does not move across membranes.

What can happen to a cell if the concentration of solutes outside is high?

• The cell becomes more permeable.

• The cell remains unchanged.

• The cell may shrivel up.

• The cell may burst.

What is the result of a high concentration of solutes inside the cell?

• The cell becomes impermeable.

• Water enters the cell.

• The cell shrivels up.

• Water leaves the cell.

What is the main force that causes water to move across the membrane?

• Presence of permeases

• Total concentration of solutes

• Temperature difference

• Cell size