Question 1

Which of the following drugs activates the receptor sites of enkephalins?

Accepted Answer

A)  curare 
B)  opiate 
C)  nicotine 
D)  none of these 
A)  curare 
B)  opiate 
C)  nicotine 
D)  none of these

Question 2

Which of the following neurotransmitters is an adrenergic messenger?

Accepted Answer

A)  acetylcholine 
B)  dopamine 
C)  taurine 
D)  all of these 
A)  acetylcholine 
B)  dopamine 
C)  taurine 
D)  all of these

Question 3

Which of the following reactions causes the detachment of tau proteins from the microtubules?

Accepted Answer

A)  hydrolysis 
B)  condensation 
C)  dissociation 
D)  phosphorylation 
A)  hydrolysis 
B)  condensation 
C)  dissociation 
D)  phosphorylation

Question 4

Which of the following statements is true of peptidergic messengers?

Accepted Answer

A)  They primarily belong to the group of hormones that affect metabolism. 
B)  They do not utilize G-protein-adenylate cyclase as a secondary messenger system. 
C)  They include neuropeptides that act as potent anorexic agents. 
D)  None of these are true. 
A)  They primarily belong to the group of hormones that affect metabolism. 
B)  They do not utilize G-protein-adenylate cyclase as a secondary messenger system. 
C)  They include neuropeptides that act as potent anorexic agents. 
D)  None of these are true.

Question 5

Which of the following is not a pathological hallmark for the postmortem identification of Alzheimer's disease?

Accepted Answer

A)  the buildup of β-amyloid plaques 
B)  neurofibrillar tangles composed of tau proteins 
C)  brain shrinkage 
D)  brain enlargement 
A)  the buildup of β-amyloid plaques 
B)  neurofibrillar tangles composed of tau proteins 
C)  brain shrinkage 
D)  brain enlargement

Question 6

Identify the reaction that is involved in the inactivation of monoamines by converting them to aldehydes.

Accepted Answer

A)  condensation 
B)  hydrolysis 
C)  oxidation 
D)  reduction 
A)  condensation 
B)  hydrolysis 
C)  oxidation 
D)  reduction

Question 7

Which of the following is not a class of chemical messengers?

Accepted Answer

A)  cholinergic 
B)  amino acid 
C)  adrenergic 
D)  carboxylic acid 
A)  cholinergic 
B)  amino acid 
C)  adrenergic 
D)  carboxylic acid

Question 8

Which of the following drugs is used to block H1 receptors of histamine?

Accepted Answer

A)  cimetidine 
B)  diphenhydramine 
C)  ranitidine 
D)  galantamine 
A)  cimetidine 
B)  diphenhydramine 
C)  ranitidine 
D)  galantamine

Question 9

Which of the following statements is true of the receptors of steroid hormones?

Accepted Answer

A)  They are hydrophilic in nature. 
B)  They are protein receptors. 
C)  Both of these statements are true. 
D)  Neither of these statements is true. 
A)  They are hydrophilic in nature. 
B)  They are protein receptors. 
C)  Both of these statements are true. 
D)  Neither of these statements is true.

Question 10

Which portion of an enkephalin is assumed to fit the receptor site?

Accepted Answer

A)  the C-terminal portion 
B)  the entire molecule 
C)  the central portion 
D)  the N-terminal portion 
A)  the C-terminal portion 
B)  the entire molecule 
C)  the central portion 
D)  the N-terminal portion

Question 11

Which of the following statements is true of nicotine?

Accepted Answer

A)  It acts as an agonist at all doses. 
B)  It acts as an antagonist at all doses. 
C)  It acts as an agonist at low doses but as an antagonist at high doses. 
D)  It acts as an agonist at high doses but as an antagonist at low doses. 
A)  It acts as an agonist at all doses. 
B)  It acts as an antagonist at all doses. 
C)  It acts as an agonist at low doses but as an antagonist at high doses. 
D)  It acts as an agonist at high doses but as an antagonist at low doses.

Question 12

Which of the following statements is true of epinephrine?

Accepted Answer

A)  It is a hormone but not a neurotransmitter. 
B)  It is a neurotransmitter but not a hormone. 
C)  It is both a hormone and a neurotransmitter. 
D)  It is neither a hormone nor a neurotransmitter. 
A)  It is a hormone but not a neurotransmitter. 
B)  It is a neurotransmitter but not a hormone. 
C)  It is both a hormone and a neurotransmitter. 
D)  It is neither a hormone nor a neurotransmitter.

Question 13

To which class of compounds do adrenergic messengers belong?

Accepted Answer

A)  amides 
B)  monoamines 
C)  amino acids 
D)  steroids 
A)  amides 
B)  monoamines 
C)  amino acids 
D)  steroids

Question 14

How many different subunits are present in an acetylcholine transmembrane receptor?

Accepted Answer

A)  four 
B)  five 
C)  six 
D)  seven 
A)  four 
B)  five 
C)  six 
D)  seven

Question 15

Which of the following ions can pass through the open ion channel of the acetylcholine receptor?

Accepted Answer

A)  K+ 
B)  Na+ 
C)  both K+ and Na+ 
D)  neither K+ nor Na+ 
A)  K+ 
B)  Na+ 
C)  both K+ and Na+ 
D)  neither K+ nor Na+

Question 16

Consider the given diagram of a neuron.   A neurotransmitter carries a nerve impulse between two neurons. Which of the following set of points correctly depicts the transmission at nerve impulse at the synapse?

Accepted Answer

A)  A to B 
B)  A to C 
C)  B to C 
A)  A to B 
B)  A to C 
C)  B to C

Question 17

Which of the following statements is true of a hormone?

Accepted Answer

A)  It acts over a short distance across a synapse. 
B)  It acts over a long distance from the secretory gland through the bloodstream to the target cell. 
C)  It acts over a short distance across a synapse and it acts over a long distance from the secretory gland through the bloodstream to the target cell, depending on the chemical properties of the hormone. 
D)  None of these 
A)  It acts over a short distance across a synapse. 
B)  It acts over a long distance from the secretory gland through the bloodstream to the target cell. 
C)  It acts over a short distance across a synapse and it acts over a long distance from the secretory gland through the bloodstream to the target cell, depending on the chemical properties of the hormone. 
D)  None of these

Question 18

Which of the following statements is true of the receptor site of amino acid neurotransmitters?

Accepted Answer

A)  All amino acids have a common receptor site. 
B)  Each amino acid has its own receptor site. 
C)  Each amino acid has only one receptor site. 
D)  None of the these statements are true. 
A)  All amino acids have a common receptor site. 
B)  Each amino acid has its own receptor site. 
C)  Each amino acid has only one receptor site. 
D)  None of the these statements are true.

Question 19

Which of the following drugs blocks the receptor sites of enkephalins?

Accepted Answer

A)  curare 
B)  morphine 
C)  opiate 
D)  none of these 
A)  curare 
B)  morphine 
C)  opiate 
D)  none of these

Question 20

Which of the following compounds is a secondary messenger?

Accepted Answer

A)  cAMP 
B)  G-protein 
C)  vasopressin 
D)  GTP 
A)  cAMP 
B)  G-protein 
C)  vasopressin 
D)  GTP

Exam 23: Chemical Communications: Neurotransmitters and Hormones

Which of the following drugs activates the receptor sites of enkephalins?

Which of the following neurotransmitters is an adrenergic messenger?

Which of the following reactions causes the detachment of tau proteins from the microtubules?

Which of the following statements is true of peptidergic messengers?

Which of the following is not a pathological hallmark for the postmortem identification of Alzheimer's disease?

Identify the reaction that is involved in the inactivation of monoamines by converting them to aldehydes.

Which of the following is not a class of chemical messengers?

Which of the following drugs is used to block H1 receptors of histamine?

Which of the following statements is true of the receptors of steroid hormones?

Which portion of an enkephalin is assumed to fit the receptor site?

Which of the following statements is true of nicotine?

Which of the following statements is true of epinephrine?

To which class of compounds do adrenergic messengers belong?

How many different subunits are present in an acetylcholine transmembrane receptor?

Which of the following ions can pass through the open ion channel of the acetylcholine receptor?

Consider the given diagram of a neuron. A neurotransmitter carries a nerve impulse between two neurons. Which of the following set of points correctly depicts the transmission at nerve impulse at the synapse?

Which of the following statements is true of a hormone?

Which of the following statements is true of the receptor site of amino acid neurotransmitters?

Which of the following drugs blocks the receptor sites of enkephalins?

Which of the following compounds is a secondary messenger?

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Which of the following drugs is used to block H₁ receptors of histamine?