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Importance of Membrane Transport

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Questions and Answers

Why is membrane transport important?

To facilitate the diffusion of large solutes

To maintain a high permeability for ions

To protect metabolic reactions within the cell from the environment (correct)

To allow communication between cells

What is the role of transport proteins in the cell membrane?

Create a hydrophobic barrier

Facilitate controlled interaction with the environment (correct)

Provide energy for metabolic reactions

Increase membrane permeability for large solutes

What type of molecules have high permeability through the membrane?

Small hydrophobic molecules (correct)

Large solutes

Charged molecules

Ions

What creates a hydrophilic passage for molecules in facilitated diffusion?

Transport proteins (B) Signup and view all the answers

What drives the movement of molecules across membranes?

Chemical gradient (D) Signup and view all the answers

What is the net driving force for molecule movement across membranes?

Electrochemical gradient (D) Signup and view all the answers

What is the main difference between active transport and passive transport?

Active transport requires energy input, while passive transport does not. (C) Signup and view all the answers

What is a common feature of transport proteins for active transport?

Pumps (A) Signup and view all the answers

In co-transport systems, which principle describes the movement of the driver ion and substrate in the opposite direction?

Revolving door principle (D) Signup and view all the answers

How are ion channels different from carriers in passive transport?

Ion channels allow passage through tight control and are gated, while carriers move solutes by conformational changes. (A) Signup and view all the answers

Which type of transporter is driven by the hydrolysis of ATP?

Pump (D) Signup and view all the answers

How would you describe the role of protein pumps in establishing electrochemical gradients?

Protein pumps couple the downward movement of one ion to the uphill movement of another solute. (B) Signup and view all the answers