Ion Channel Proteins in Cell Membranes
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Questions and Answers

What is the primary reason why ligand gated ion channels can exhibit a diverse range of structural and functional properties?

  • The different compositions of the multi-metric complexes that make up the channels (correct)
  • The involvement of intermediate biochemical steps in the activation process
  • The speed of the response (in milliseconds) due to direct activation of the channel
  • The functional role of these receptors in synaptic transmission

What is the primary reason for the very fast (millisecond) response of ligand gated ion channels?

  • The diverse structural and functional properties of the different multi-metric complexes
  • The involvement of intermediate biochemical steps in the activation process
  • The important functional role of these receptors in synaptic transmission
  • The direct interaction between the ligand and the ion channel, which influences ion flow (correct)

How do ligand gated ion channels influence the electrical state of the cell membrane?

  • By playing an important functional role in synaptic transmission
  • By directly activating intermediate biochemical steps
  • By contributing to the diversity of structural and functional properties
  • By directly influencing ion flow, leading to either hyperpolarization or depolarization (correct)

Why do ligand gated ion channels play an important functional role in synaptic transmission?

<p>Because of their very fast (millisecond) response time (C)</p> Signup and view all the answers

Which of the following is NOT a reason for the diversity in structural and functional properties of ligand gated ion channels?

<p>The involvement of intermediate biochemical steps in the activation process (B)</p> Signup and view all the answers

What is the function of an ion channel protein when it is open?

<p>It creates a water-filled pore for the movement of ions (A)</p> Signup and view all the answers

How does the selectivity of ion channels for specific ions occur?

<p>Based on the charge and size of the structure inside the pore (C)</p> Signup and view all the answers

What regulates the gating of ion channels between open and closed states?

<p>Binding of specific ligands to the channel (C)</p> Signup and view all the answers

How are many ligand-gated ion channels structured?

<p>Multimeric, composed of multiple protein subunits (A)</p> Signup and view all the answers

What influences the switching between open and closed states in ion channels?

<p>Binding of different ligands to specific sites on the channel (C)</p> Signup and view all the answers

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