MCQOPTIONS

Explore topic-wise MCQs in Biology.

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