MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Action potentials can be inhibitory. True or false? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
What happens when a neurotransmitter binds to a receptor on the post-synaptic membrane? |
| A. | Opening of ion channels |
| B. | Conformational changes in the neuron |
| C. | Graded potential is transmitted across the neuron |
| D. | It becomes impermeable to all ions |
| Answer» B. Conformational changes in the neuron | |
| 3. |
Which of these structures are present on the post-synaptic membrane? |
| A. | Synaptic knobs |
| B. | Synaptic vesicles |
| C. | Receptors |
| D. | Schwan cells |
| Answer» D. Schwan cells | |
| 4. |
What happens to synaptic vesicles during an action potential? |
| A. | They degrade their contents |
| B. | They open up inside the synaptic knob |
| C. | They move towards and fuse with the plasma membrane |
| D. | They are released into the synapse |
| Answer» D. They are released into the synapse | |
| 5. |
Which of these are involved in the transmission of nerve impulses? |
| A. | Synaptic knob |
| B. | Schwan cells |
| C. | Nissl s granules |
| D. | Neurotransmitters |
| Answer» E. | |
| 6. |
The outer surface of the axon has a positive charge at resting membrane potential. True or false? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Which of these is false regarding synaptic clefts? |
| A. | It lies between the membranes of pre and post-synaptic neurons |
| B. | It is a fluid filled space |
| C. | Electrical synapses have large synaptic clefts |
| D. | It is a portion of the synapse |
| Answer» D. It is a portion of the synapse | |
| 8. |
Which of the following statements is false regarding electrical synapses? |
| A. | Membranes of pre and post-synaptic neurons are in very close proximity |
| B. | Transmission is always faster than that across a chemical synapse |
| C. | It is similar to impulse conduction along a single axon |
| D. | Electrical synapses are common in our system |
| Answer» E. | |
| 9. |
Which of these is not a component of the synapse? |
| A. | Synaptic vesicles |
| B. | Pre-synaptic membrane |
| C. | Post-synaptic membrane |
| D. | Synaptic cleft |
| Answer» B. Pre-synaptic membrane | |
| 10. |
Nerve impulses are transmitted from one neuron to another via which of these? |
| A. | Schwan cells |
| B. | Nissl s granules |
| C. | Synapses |
| D. | Myelin sheath |
| Answer» D. Myelin sheath | |
| 11. |
How is the resting potential restored after a nerve impulse? |
| A. | Potassium ions diffuse inside the membrane |
| B. | Potassium ions diffuse outside the membrane |
| C. | The membrane becomes impermeable to potassium ions |
| D. | There is no movement of potassium ions |
| Answer» C. The membrane becomes impermeable to potassium ions | |
| 12. |
What is a nerve impulse also known as? |
| A. | Action potential |
| B. | Graded potential |
| C. | Resting potential |
| D. | Membrane potential |
| Answer» B. Graded potential | |
| 13. |
Which of these does not take place when a stimulus is applied to a polarized axonal membrane? |
| A. | It becomes permeable to sodium ions |
| B. | The membrane is depolarized |
| C. | There is a slow influx of sodium ions |
| D. | Outer surface of the membrane becomes negatively charged |
| Answer» D. Outer surface of the membrane becomes negatively charged | |
| 14. |
Which of the following is not true regarding resting potential? |
| A. | There is a potential difference across the plasma membrane |
| B. | The potential difference is maintained by the Na-K pump |
| C. | The outer surface of the membrane is negatively charged |
| D. | The axonal membrane is polarized |
| Answer» D. The axonal membrane is polarized | |
| 15. |
At resting membrane potential, the axonal membrane is impermeable to which ions? |
| A. | Calcium ions |
| B. | Sodium ions |
| C. | Potassium ions |
| D. | Chlorine ions |
| Answer» C. Potassium ions | |