Biochemistry Questions and Answers – Gated Ion Channels

This set of Biochemistry Multiple Choice Questions & Answers (MCQs) focuses on “Gated Ion Channels”.

1. Which of the following statements is true about transmembrane electrical potential?
a) The chemical gradient drives Cl^– and K⁺ inwards
b) The electrical gradient drives Na⁺ and Ca⁺² inwards
c) The chemical gradient drives Na⁺ and Ca⁺² inwards and K⁺ outward
d) The chemical gradient drives Cl^– and K⁺ outwards
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2. Nicotinic acetylcholine receptor is an example of _____________
a) Ligated gated receptor channel
b) Serpentine receptors
c) Adhesion receptors
d) Receptor enzymes
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3. Which of the following are intracellular second messengers?
a) Acetylcholine
b) Glycine
c) IP₃
d) Glutamate
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4. The receptor channels for which of the following are gated by extracellular ligands?
a) Glycine
b) IP₃
c) cAMP
d) cGMP
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5. Which of the following statements is false about a ligand-gated ion channel receptor?
a) They are present in the cell membrane
b) They consist of five glycoproteins
c) Differences in membrane potential affect whether the channel receptors are open or close
d) Neurotransmitters can act as the chemical messengers for these channels
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6. Voltage regulation means ____________
a) Na⁺/K⁺ pumps controls potential
b) Unless the voltage is regular gates will not respond
c) Oscilloscope only can control potential
d) With changes in the membrane potential voltage gated ion channels open and close
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7. Depolarization and repolarization changes that occur during the action potential are produced by ____________
a) Negative feedback loops
b) Carrier mediated transport
c) Simple diffusion of ions down their concentration gradient
d) Active transport pumps along the neuron membrane
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8. Diffusion of K⁺ out of the cell makes the inside of it less positive, or more negative and acts to restore the original resting membrane potential. This process is called ____________
a) Repolarization
b) Depolarization
c) Hyperpolarization
d) Overshoot
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9. Which of the following statements about action potential is false?
a) Na⁺/K⁺ pumps are directly involved in creating the action potential
b) Na⁺ and K⁺ concentrations are not significantly changed during an action potential
c) This includes both positive and negative feedback loops
d) Only a relatively small number of Na⁺ and K⁺ actually diffuse across the membrane
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10. Which out of the following is not a neurotransmitter?
a) Noadrenaline
b) Cyclic AMP
c) Dopamine
d) Acetyl choline
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Sanfoundry Global Education & Learning Series – Biochemistry.

To practice all areas of Biochemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.

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