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Cell Membrane Transport Mechanisms

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Questions and Answers

What is the primary difference between simple diffusion and facilitated diffusion?

Facilitated diffusion requires energy, whereas simple diffusion does not

Facilitated diffusion involves transport proteins, whereas simple diffusion does not (correct)

Simple diffusion involves transport proteins, whereas facilitated diffusion does not

Simple diffusion requires energy, whereas facilitated diffusion does not

In which direction does osmosis occur?

From an area of high solute concentration to an area of low solute concentration

From an area of low water concentration to an area of high water concentration

From an area of high water concentration to an area of low water concentration

From an area of low solute concentration to an area of high solute concentration (correct)

What is the primary characteristic of active transport?

It involves the movement of molecules from an area of low concentration to an area of high concentration

It requires energy in the form of ATP (correct)

It does not require energy

It only occurs through a selectively permeable membrane

Which of the following types of transport does not require energy?

Facilitated diffusion Signup and view all the answers

What is the direction of molecule movement in simple diffusion?

From an area of high concentration to an area of low concentration Signup and view all the answers

What is the primary function of transport proteins in facilitated diffusion?

To facilitate the movement of molecules across the membrane Signup and view all the answers

What is the result of a concentration gradient on the movement of molecules in active transport?

The movement of molecules is hindered by the concentration gradient Signup and view all the answers

What is the key difference between osmosis and facilitated diffusion?

The type of molecules being transported Signup and view all the answers

In which type of transport process is the movement of molecules from an area of low concentration to an area of high concentration?

Active transport Signup and view all the answers

What is the role of ATP in active transport?

To provide the necessary energy for transport Signup and view all the answers

Study Notes

Types of Cellular Transport

Simple Diffusion: Movement of molecules from high concentration to low concentration areas without energy or transport proteins.
Characteristics: No energy required, no transport proteins involved, moves from high to low concentration.

Assisted Cellular Transport

Facilitated Diffusion: Movement of molecules across the membrane via specific transport proteins, no energy required.
Key feature: Involves transport proteins, but no energy is needed.

Water Transport

Osmosis: Diffusion of water through a selectively permeable membrane from low solute concentration to high solute concentration areas.
Direction: Water moves from low solute concentration to high solute concentration areas.

Energy-Dependent Transport

Active Transport: Movement of molecules against their concentration gradient, requiring energy in the form of ATP and transport proteins.
Key feature: Energy from ATP is required to move molecules against their concentration gradient.

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Description

Test your understanding of cell membrane transport mechanisms, including simple diffusion, facilitated diffusion, osmosis, and active transport. Learn how molecules and water move across the cell membrane with or without energy and transport proteins.