|| 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 pro- tein 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 1.8 pA. How many potassium ions pass through if the ion channel opens for 1.0 ms?

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High-resolution measurements have shown that an ion channel (see the attached problem) is a 0.30-nm-diameter cylinder with length of 5.0 nm. The intracellular fluid filling the ion channel has resistivity 0.60 Ω • m. What is the resistance of the ion channel?

|| 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 pro-
tein 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 1.8 pA. How
many potassium ions pass through if the ion channel opens for
1.0 ms?
Transcribed Image Text:|| 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 pro- tein 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 1.8 pA. How many potassium ions pass through if the ion channel opens for 1.0 ms?
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