MCQOPTIONS
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MCQOPTIONS
This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which out of the following is not a neurotransmitter? |
| A. | Noadrenaline |
| B. | Cyclic AMP |
| C. | Dopamine |
| D. | Acetyl choline |
| Answer» C. Dopamine | |
| 2. |
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 |
| Answer» C. This includes both positive and negative feedback loops | |
| 3. |
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 |
| Answer» B. Depolarization | |
| 4. |
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 |
| Answer» E. | |
| 5. |
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 |
| Answer» E. | |
| 6. |
Nicotinic acetylcholine receptor is an example of _____________ |
| A. | Ligated gated receptor channel |
| B. | Serpentine receptors |
| C. | Adhesion receptors |
| D. | Receptor enzymes |
| Answer» B. Serpentine receptors | |
| 7. |
WHICH_OF_THE_FOLLOWING_STATEMENTS_ABOUT_ACTION_POTENTIAL_IS_FALSE??$ |
| A. | Na<sup>+</sup>/K<sup>+</sup> pumps are directly involved in creating the action potential |
| B. | Na<sup>+</sup> and K<sup>+</sup> 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<sup>+</sup> and K<sup>+</sup> actually diffuse across the membrane |
| Answer» C. This includes both positive and negative feedback loops | |
| 8. |
Which_out_of_the_following_is_not_a_neurotransmitter?$ |
| A. | Noadrenaline |
| B. | Cyclic AMP |
| C. | Dopamine |
| D. | Acetyl choline |
| Answer» C. Dopamine | |
| 9. |
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 calle? |
| A. | Repolarization |
| B. | Depolarization |
| C. | Hyperpolarization |
| D. | Overshoot |
| Answer» B. Depolarization | |
| 10. |
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 |
| Answer» E. | |
| 11. |
Voltage regulation means |
| A. | Na<sup>+</sup>/K<sup>+</sup> 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 |
| Answer» E. | |
| 12. |
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 |
| Answer» D. Neurotransmitters can act as the chemical messengers for these channels | |
| 13. |
The receptor channels for which of the following are gated by extracellular ligands? |
| A. | Glycine |
| B. | IP<sub>3</sub> |
| C. | cAMP |
| D. | cGMP |
| Answer» B. IP<sub>3</sub> | |
| 14. |
Which of the following are intracellular second messengers? |
| A. | Acetylcholine |
| B. | Glycine |
| C. | IP3 |
| D. | Glutamate |
| Answer» D. Glutamate | |
| 15. |
Nicotinic acetylcholine receptor is an example of |
| A. | Ligated gated receptor channel |
| B. | Serpentine receptors |
| C. | Adhesion receptors |
| D. | Receptor enzymes |
| Answer» B. Serpentine receptors | |
| 16. |
Which of the following statements is true about transmembrane electrical potential? |
| A. | The chemical gradient drives Cl<sup>–</sup> and K<sup>+</sup> inwards |
| B. | The electrical gradient drives Na<sup>+</sup> and Ca<sup>+2</sup> inwards |
| C. | The chemical gradient drives Na<sup>+</sup> and Ca<sup>+2</sup> inwards and K<sup>+</sup> outward |
| D. | The chemical gradient drives Cl<sup>–</sup> and K<sup>+</sup> outwards |
| Answer» D. The chemical gradient drives Cl<sup>‚Äö√Ñ√∂‚àö√ë‚àö¬®</sup> and K<sup>+</sup> outwards | |