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Constants Part A The biochemistry that takes place inside cells depends on vario

ID: 1875686 • Letter: C

Question

Constants Part A 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 1.9 pA How many potassium ions pass through if the ion channel opens for 2.25 ms ? Express your answer using three significant tigures View Available Hint(s)

Explanation / Answer

Current, I= 1.9*10-12 A

Applying quantisation of charge,

I= ne/ t

1.9*10-12= n(1.6*10-19)/(2.25*10-3)

n= 2.672*104 ions

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