Podcast
Questions and Answers
Which type of membrane transporter moves a wide variety of ions and molecules across cellular membranes, but at a much slower rate than channels?
Which type of membrane transporter moves a wide variety of ions and molecules across cellular membranes, but at a much slower rate than channels?
- Symporters
- Uniporters
- Aquaporins
- Antiporters (correct)
Which type of membrane proteins serve as channels in the transfer of water into or outside of the cell?
Which type of membrane proteins serve as channels in the transfer of water into or outside of the cell?
- Channel proteins
- Na+/K+ pump
- Aquaporins (correct)
- Membrane Transporters
What is the subunit of the ATP-sensitive inward-rectifier potassium-channel that binds to ATP, causing its shutting down and thus depolarizing the cell surface?
What is the subunit of the ATP-sensitive inward-rectifier potassium-channel that binds to ATP, causing its shutting down and thus depolarizing the cell surface?
- GLUT2
- Aquaporins
- SUR1
- Kir6.2 (correct)
What is the mechanism by which high blood glucose levels induce the entry of glucose into β cells?
What is the mechanism by which high blood glucose levels induce the entry of glucose into β cells?
What drives the fusion of insulin granules with the cell membrane, causing the release of insulin by exocytosis?
What drives the fusion of insulin granules with the cell membrane, causing the release of insulin by exocytosis?
Which type of substances cross the membrane more readily than charged and polar substances?
Which type of substances cross the membrane more readily than charged and polar substances?
What is the primary factor that determines the permeability of substances across the lipid bilayer structure?
What is the primary factor that determines the permeability of substances across the lipid bilayer structure?
Which type of substances diffuse across the membrane without the need for a transport protein?
Which type of substances diffuse across the membrane without the need for a transport protein?
In which direction does simple diffusion transport substances across the membrane?
In which direction does simple diffusion transport substances across the membrane?
Under what conditions do membrane transport proteins use energy to transport ions or substances?
Under what conditions do membrane transport proteins use energy to transport ions or substances?
