Podcast
Questions and Answers
What process describes the movement of molecules from an area of high concentration to an area of low concentration?
What process describes the movement of molecules from an area of high concentration to an area of low concentration?
- Osmosis
- Active Transport
- Endocytosis
- Facilitated Diffusion (correct)
Which type of ion channels open or close when the ionic charge across the membrane changes?
Which type of ion channels open or close when the ionic charge across the membrane changes?
- Bulk Transport
- Gated channels
- Chemically-gated ion channels
- Voltage-gated ion channels (correct)
What is the main characteristic of endocytosis?
What is the main characteristic of endocytosis?
- Diffusion of water across a selectively permeable membrane
- Transporting molecules in the direction opposite the concentration gradient
- Movement of molecules from an area of high concentration to an area of low concentration
- Ingestion of materials by cells (correct)
Which process requires energy (ATP) to transport molecules against the concentration gradient?
Which process requires energy (ATP) to transport molecules against the concentration gradient?
What is the process by which water diffuses across a selectively permeable membrane?
What is the process by which water diffuses across a selectively permeable membrane?
Which process involves the transporter protein binding to the substrate on one side of the plasma membrane and changing shape to release it on the other side?
Which process involves the transporter protein binding to the substrate on one side of the plasma membrane and changing shape to release it on the other side?
What type of ion channels require a signal to open or close them?
What type of ion channels require a signal to open or close them?
Which method involves cells ingesting materials as a method of feeding by single-celled organisms?
Which method involves cells ingesting materials as a method of feeding by single-celled organisms?
What happens when signaling molecules bind to a binding site on transmembrane proteins?
What happens when signaling molecules bind to a binding site on transmembrane proteins?
'Cell eating' is another term used for which process?
'Cell eating' is another term used for which process?
