The channel being recorded spends more time open than it does closed.
The flow of ions through the channel is indicated by the increase in current.
Sodium flows through the channel more often than calcium.
The channel allows both negative and positive ions to flow through.
None of these is true.
Binding of a ligand to its receptor of the cell membrane can directly cause:
Opening of an ion channel.
Activation of a carrier protein.
None of the above.
Glucose moves _____ its concentration gradient from the intestinal lumen into cells, and then ________ its gradient across the basal lamina.
Decreasing the proton concentration in the mitochondrial intermembrane space would __________ the production of ATP, via ATP synthase, an ______________________.
increase, F-type pump
Increase, ABC transporter
Decrease, F-type pump
Decrease, ABC transporter
Caffeine is an agonist for the ryanodine receptor. What effect would an increase in intracellular caffeine have on muscle cells? Why? There may be multiple correct answers.
Muscle cells would contract more often because calcium would be released more often from the SR.
Muscles would become more stiff because calcium would be removed from the cell more quickly.
Muscle contraction would be stronger because more calcium would be released into the cytoplasm.
None of these.
In which answer have the molecule been correctly arranged by their ability to freely diffuse across the plasma membrane, from least to most permeable.
Ethanol, K+, nitrous oxide (NO), glucose.
Sodium ions, glucose, oxygen, water.
Protons , glucose, ethanol, carbon dioxide.
Water, Cl-, glucose, nitrous oxide (NO).
Which of the following are true about voltage-gated ion channels?
Size of pore and ability of channel to strip ion of water molecules determines which ions are allowed through.
They only participate in passive transport.
Most of them are opened by depolarization.
Some of them contain an inactivating loop.
__________________ ATPases are responsible for pumping protons ________ their electrochemical gradient into vesicles. The proton gradient is then used to transport neurotransmitter __________ the vesicles.