Norepinephrine 01

Topic: Pharmacology

Created on Saturday, October 18 2008 by jdmiles

Last modified on Saturday, October 18 2008.

 
        A) Methionine
 
        B) Dopamine
 
        C) Lysine
 
        D) Collagen
 
        E) Serine
 

 

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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

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A) 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.  (See References)

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B) 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.  (See References)

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---

C) 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.  (See References)

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---

D) Collagen

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.  (See References)

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---

E) Serine

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.  (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)

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pharmacology
Norepinephrine 01
Question ID: 101808183
Question written by J. Douglas Miles, (C) 2006-2009, all rights reserved.
Created: 10/18/2008
Modified: 10/18/2008
Estimated Permutations: 3036000