10 Questions
Which type of membrane transporter moves a wide variety of ions and molecules across cellular membranes, but at a much slower rate than channels?
Antiporters
Which type of membrane proteins serve as channels in the transfer of water into or outside of the cell?
Aquaporins
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?
Kir6.2
What is the mechanism by which high blood glucose levels induce the entry of glucose into β cells?
Passive transport through glucose transporter (GLUT2)
What drives the fusion of insulin granules with the cell membrane, causing the release of insulin by exocytosis?
Ca2+ influx into the cell
Which type of substances cross the membrane more readily than charged and polar substances?
Hydrophobic substances
What is the primary factor that determines the permeability of substances across the lipid bilayer structure?
Chemical nature of the substances
Which type of substances diffuse across the membrane without the need for a transport protein?
Gases such as O2 and CO2
In which direction does simple diffusion transport substances across the membrane?
From high to low concentration
Under what conditions do membrane transport proteins use energy to transport ions or substances?
When transporting ions against concentration / electrical gradient
Test your knowledge of transport of substances across the cell membrane and organellar membrane. Understand the permeability of substances across the lipid bilayer structure.
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