Analog Electronics
The extremely high input impedance of a MOSFET is primarily due to the

  absence of its channel.
  extremely small leakage electric current of its gate capacitor.
  negative gate-source voltage.
  depletion of electric current carriers.

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward biased, while low resistance when reverse bias
 High resistance when forward or reverse biased

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