Passive Transport – Transport Across Cell Membranes
About the Lecture
The lecture Passive Transport – Transport Across Cell Membranes by Georgina Cornwall, PhD is from the course Cellular Structure.
Included Quiz Questions
Which of the following best describes passive transport across cell membranes?
- Molecules move down the concentration gradient with zero energy expenditure.
- Molecules move down the concentration gradient by using one ATP for each molecule transferred.
- Molecules move up the concentration gradient with zero energy expenditure.
- Molecules move in either direction and independently of a concentration gradient.
- Molecules move up the concentration gradient by using one ATP for each molecule moved.
Which of the following is required for facilitated diffusion?
- Participation of carrier or channel proteins
- Participation of peripheral proteins
- Participation of phospholipid molecules
- Participation of hydrophobic molecules
- Participation of the hydrophilic heads of phospholipids
Which statement is INCORRECT about facilitated diffusion across the plasma membrane?
- The rate of facilitated diffusion of glucose across the cell membrane is directly dependent on the number of ATP molecules hydrolyzed during the movement of glucose molecules.
- Facilitated diffusion does not utilize any energy during the transfer of molecules from the exterior to the interior of the cell.
- Conformational changes in the carrier proteins of gated channels lead to the opening and closing of gated channels.
- Carrier proteins or gated channels provide a selective aqueous passage for hydrophilic and larger molecules.
- During facilitated diffusion, molecules move down their concentration gradients across the cell membrane.
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Author of lecture Passive Transport – Transport Across Cell Membranes
Georgina Cornwall, PhD
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Easy to understand.I like how she uses examples to illustrate passive vs. active transport.
very good, is complicated, but i understand everything, she is a good teacher
couldnt understand a thing. Please try to use animation to explain better
