Electric current is defined as the rate of charge flow beyond a given point in an electric circuit.
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed from a specialized protein molecule, is selective for one type of ion. When an ion channel opens in a cell wall, monovalent (charge e) ions flow through the channel at a rate of 3 × 107 ions/s.
(a) what is the current through the channel.
A) 3 × 107 A
B) 1.6 × 10-12 A
C) 4.8 × 10-12 A
D) 6 × 10-7 A
E) None of the above.
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