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Epinephrine 01

Topic: Pharmacology

Created on Saturday, October 18 2008 by jdmiles

Last modified on Saturday, October 18 2008.

From which of the following is epinephrine synthesized?

 
        A) Threonine
 
        B) Lysine
 
        C) Dopamine
 
        D) Methionine
 
        E) Fruit
 

 


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This question was created on October 18, 2008 by jdmiles.
This question was last modified on October 18, 2008.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ANSWERS AND EXPLANATIONS




A) Threonine

This answer is incorrect.


Dopamine, epinephrine, and norepinephrine (the catecholamine neurotransmitters) are all derived from tyrosine.
The first (and rate-limiting) step in the synthesis of dopamine is the conversion of tyrosine into L-DOPA by tyrosine hydroxylase.
Then, L-DOPA is converted into Dopamine by DOPA decarboxylase.
Dopamine is converted to norepinephrine by dopamine beta-hydroxylase.
Epinephrine is synthesized from norepinephrine by phenylethanolamine-N-methyl transferase.  (See References)

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B) Lysine

This answer is incorrect.


Dopamine, epinephrine, and norepinephrine (the catecholamine neurotransmitters) are all derived from tyrosine.
The first (and rate-limiting) step in the synthesis of dopamine is the conversion of tyrosine into L-DOPA by tyrosine hydroxylase.
Then, L-DOPA is converted into Dopamine by DOPA decarboxylase.
Dopamine is converted to norepinephrine by dopamine beta-hydroxylase.
Epinephrine is synthesized from norepinephrine by phenylethanolamine-N-methyl transferase.  (See References)

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C) Dopamine

This answer is correct.


Dopamine, epinephrine, and norepinephrine (the catecholamine neurotransmitters) are all derived from tyrosine.
The first (and rate-limiting) step in the synthesis of dopamine is the conversion of tyrosine into L-DOPA by tyrosine hydroxylase.
Then, L-DOPA is converted into Dopamine by DOPA decarboxylase.
Dopamine is converted to norepinephrine by dopamine beta-hydroxylase.
Epinephrine is synthesized from norepinephrine by phenylethanolamine-N-methyl transferase.  (See References)

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D) Methionine

This answer is incorrect.


Dopamine, epinephrine, and norepinephrine (the catecholamine neurotransmitters) are all derived from tyrosine.
The first (and rate-limiting) step in the synthesis of dopamine is the conversion of tyrosine into L-DOPA by tyrosine hydroxylase.
Then, L-DOPA is converted into Dopamine by DOPA decarboxylase.
Dopamine is converted to norepinephrine by dopamine beta-hydroxylase.
Epinephrine is synthesized from norepinephrine by phenylethanolamine-N-methyl transferase.  (See References)

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E) Fruit

This answer is incorrect.


Dopamine, epinephrine, and norepinephrine (the catecholamine neurotransmitters) are all derived from tyrosine.
The first (and rate-limiting) step in the synthesis of dopamine is the conversion of tyrosine into L-DOPA by tyrosine hydroxylase.
Then, L-DOPA is converted into Dopamine by DOPA decarboxylase.
Dopamine is converted to norepinephrine by dopamine beta-hydroxylase.
Epinephrine is synthesized from norepinephrine by phenylethanolamine-N-methyl transferase.  (See References)

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References:

1. Kandel, E.R., Schwartz, J.H., and Jessel, T.M. (2000). Principles of Neural Science, 4th ed. McGraw-Hill, New York. (ISBN:0838577016) Advertising:
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pharmacology
Epinephrine 01
Question ID: 101808189
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 10/18/2008
Modified: 10/18/2008
Estimated Permutations: 3825360

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