BIMS 4323 :NEUROBIOLOGY EXAM TEST 1 (SOLVED 100% GUARANTEED PASS)
1. Which of the following neurotransmitters have tyrosine as a precursor?
a) Dopamine
b) Noradrenaline
c) Adrenaline
d) All of those neurotransmitters are synthesized from tyrosine
e) None of these neurotransmitters is synthesized from tyrosine
2. Which of the following is a G-protein coupled receptor?
a) GABAA receptor
b) Muscarinic receptor
c) Glutamate receptor of NMDA type
d) Glutamate receptor of AMPA type
e) All of these are examples of G-protein coupled receptors
3. The GABAA receptor is permeable to:
a) Na+ ions
b) K+ ions
c) Both Na+ and K+ ions
d) Cl- ions
e) Ca 2+ ions
4. A generic neurotransmitter binds to a postsynaptic receptor and causes ligand-gated ion
channels to open. K+ ions pass through these channels. The resting membrane potential of the
postsynaptic cell is -65mV. Which of the following statements is correct?
a) K+ enters but there is no change in potential
b) K+ exits, but there is no change in potential
c) K+ enters and there is net depolarization
d) K+exits and there is net depolarization
e) K+ enters and there is net hyperpolarization
f) K+ exits and there is net hyperpolarization
5. The amount of neurotransmitter released at the level of the presynaptic terminal is determined
by the:
a) Velocity of the retrograde axoplasmic transport
b) Amplitude of the action potential
c) Diameter of the axon
d) Frequency of action potentials
e) Length of the axon
6. Which unit the resistance of a neuron is measured?
a) Millivolt (mV)
, b) Nanoamper (nA)
c) Megaohm (mΩ)
d) Hertz (Hz)
e) All of the above
7. Which of the first even that occurs when an action potential reaches the synaptic terminal?
a) The released neurotransmitter is reuptaken
b) The synaptic vesicles fuse into the plasma membrane
c) Voltage-gated calcium channels open
d) The neurotransmitter is loaded into the synaptic vesicles
e) The synaptic vesicles are recycled
8. Which of the following statements about axoplasmic transport is incorrect?
a) Anterograde axoplasmic transport is mediated by kinesin
b) Retrograde axoplasmic transport is mediated by dynein
c) Anterograde axoplasmic transport does not require ATP
d) Substances to be recycled are transported from the axonal terminal to the soma
via retrograde axoplasmic transport
9. In a neuron at rest, the membrane potential is:
a) Positive because at rest the membrane is mainly permeable to K+
b) Negative because at rest the membrane is mainly permeable to K+
c) Positive because at rest the membrane is mainly permeable to Na+
d) Negative because at rest the membrane is mainly permeable to Na+
10. Characteristics of the action potential include:
a) The action potential does not require energy to be generated
b) The action potential travels along the axon
c) The action potential is an “all-or-nothing” phenomenon
d) The action potential cannot be evoked during the absolute refractory period
e) All of these are characteristics associated with the action potential
11. Atropine is:
a) An antagonist of muscarinic receptors
b) An agonist of muscarinic receptors
c) An antagonist of nicotinic receptors
d) An agonist of nicotinic receptors
e) None of the above
1. Which of the following neurotransmitters have tyrosine as a precursor?
a) Dopamine
b) Noradrenaline
c) Adrenaline
d) All of those neurotransmitters are synthesized from tyrosine
e) None of these neurotransmitters is synthesized from tyrosine
2. Which of the following is a G-protein coupled receptor?
a) GABAA receptor
b) Muscarinic receptor
c) Glutamate receptor of NMDA type
d) Glutamate receptor of AMPA type
e) All of these are examples of G-protein coupled receptors
3. The GABAA receptor is permeable to:
a) Na+ ions
b) K+ ions
c) Both Na+ and K+ ions
d) Cl- ions
e) Ca 2+ ions
4. A generic neurotransmitter binds to a postsynaptic receptor and causes ligand-gated ion
channels to open. K+ ions pass through these channels. The resting membrane potential of the
postsynaptic cell is -65mV. Which of the following statements is correct?
a) K+ enters but there is no change in potential
b) K+ exits, but there is no change in potential
c) K+ enters and there is net depolarization
d) K+exits and there is net depolarization
e) K+ enters and there is net hyperpolarization
f) K+ exits and there is net hyperpolarization
5. The amount of neurotransmitter released at the level of the presynaptic terminal is determined
by the:
a) Velocity of the retrograde axoplasmic transport
b) Amplitude of the action potential
c) Diameter of the axon
d) Frequency of action potentials
e) Length of the axon
6. Which unit the resistance of a neuron is measured?
a) Millivolt (mV)
, b) Nanoamper (nA)
c) Megaohm (mΩ)
d) Hertz (Hz)
e) All of the above
7. Which of the first even that occurs when an action potential reaches the synaptic terminal?
a) The released neurotransmitter is reuptaken
b) The synaptic vesicles fuse into the plasma membrane
c) Voltage-gated calcium channels open
d) The neurotransmitter is loaded into the synaptic vesicles
e) The synaptic vesicles are recycled
8. Which of the following statements about axoplasmic transport is incorrect?
a) Anterograde axoplasmic transport is mediated by kinesin
b) Retrograde axoplasmic transport is mediated by dynein
c) Anterograde axoplasmic transport does not require ATP
d) Substances to be recycled are transported from the axonal terminal to the soma
via retrograde axoplasmic transport
9. In a neuron at rest, the membrane potential is:
a) Positive because at rest the membrane is mainly permeable to K+
b) Negative because at rest the membrane is mainly permeable to K+
c) Positive because at rest the membrane is mainly permeable to Na+
d) Negative because at rest the membrane is mainly permeable to Na+
10. Characteristics of the action potential include:
a) The action potential does not require energy to be generated
b) The action potential travels along the axon
c) The action potential is an “all-or-nothing” phenomenon
d) The action potential cannot be evoked during the absolute refractory period
e) All of these are characteristics associated with the action potential
11. Atropine is:
a) An antagonist of muscarinic receptors
b) An agonist of muscarinic receptors
c) An antagonist of nicotinic receptors
d) An agonist of nicotinic receptors
e) None of the above
