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. Measurements with microelectrodes
have shown that a 0.30-nm-diameter potassium
ion (K+) channel carries a current of
1.7 pA . How many potassium ions pass through if the
ion channel opens for 1.25 ms ?