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Membrane Transport Mechanisms Quiz

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Questions and Answers

What type of substances cannot diffuse through the phospholipid bilayer of cell membranes?

Both large polar molecules and ions (correct)

Small non-polar molecules

Charged ions

Large polar molecules

Which type of diffusion involves the assistance of proteins in crossing the phospholipid bilayer?

Active transport

Facilitated diffusion (correct)

Simple diffusion

Osmosis

What are the two types of proteins that enable facilitated diffusion?

Receptor proteins and enzyme proteins

Glycoproteins and lipoproteins

Channel proteins and carrier proteins (correct)

Integral proteins and peripheral proteins

Which type of protein allows charged substances like ions to diffuse through the cell membrane?

Carrier proteins Signup and view all the answers

How do most channel proteins operate to control the exchange of ions?

By being 'gated' Signup and view all the answers

Which process requires energy for the movement of substances against their concentration gradient?

Active transport Signup and view all the answers

What is the main function of carrier proteins in facilitated diffusion?

To bind to specific substances and transport them across the membrane Signup and view all the answers

Why are carrier proteins considered highly specific?

They only allow one type of molecule or ion to pass through Signup and view all the answers

'Gated' channel proteins control the movement of ions by:

...undergoing a change in shape to regulate ion flow Signup and view all the answers

'Carrier proteins in facilitated diffusion are essential because they:

...bind to specific substances and assist in their transport Signup and view all the answers