Ion Channels Quiz

Both ion channels and active transporters can bring about changes in membrane potential. 

True

Which of the following are true regarding active transporters?

All answers are true

Active transporters move ions against their concentration gradients.

True

Ion channels allow ions to move from an area of low ionic concentration to an area of high ionic concentration.

False

Ion movement (or ion flux) is determined by both concentration gradients and electrical gradients.

True

Which of the following are true regarding sodium ions in solution (water)?

The sodium ion is attracted to the oxygen atom of a water molecule

A gap junction is comprised of 2 connexon subunits. A gap junction allows for the direct communication between cytoplasms of two neurons.

True

Whereas voltage-clamping allows one to observe current flowing through many channels, patch-clamping allows one to observe current flow through a single channel.

True

A hydrophobicity plot is used to determine the degree of attraction between water and a region or segment of an ion channel.

True

Diffusion of ions through ion channels does not require energy input in the form of ATP.

True