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biochemistry endo > conversion of amino acids to specialized products > Flashcards

conversion of amino acids to specialized products Flashcards

1
Q 
Serves as a carrier of ammonia and if the carbons pyruvate from skeletal muscle to liver via Cori cycle
A. Cysteine
B. Cystine
C. Alanine
D. Arginine
A

C.

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2
Q 
Carrier of nitrogen atoms in urea biosynthesis
A. Cysteine
B. Cystine
C. Alanine
D. Arginine
A

D.

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3
Q

Arginine following conversion to ornithine, its carbon skeleton becomes that if polyamines of

A

Putrescine and spermine

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4
Q 
Example of water soluble glycine conjugates excreted in the urine
A.hippuric acid
B.glycocholic acid
C.taurocholic acid
D.a and b
E.b and c
A

D

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5
Q

Enzyme used for decarboxylation of histidine to form histamine

A

Histidine decarboxylase

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6
Q 
Example of histidine compounds present in the body except
A. Hippurate
B. Ergothioneine
C. Carnosine
D. Anserine
A

A-glycine conjugate

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7
Q 
Serine participates in the following except in biosynthesis of
A.sphingosine
B.tyrosine
C.purines
D.pyrimidines
A

B.

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8
Q

Decarboxylation of 5-hydroxytryptohpan forms

A

Serotonin (5-hydroxytryptamine)

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9
Q

N-acetylation of serotnin followed by O-methylation in the pineal body forms

A

Melatonin

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10
Q

The normal urinary catabolites of tryptophan are:

A

5-hydroxyindoleacetate and indole 3-acetate

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11
Q

A pyridoxical phosphate-dependent enzyme that forms dopamine

A

Dopa decarboxylase

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12
Q

Hydroxylation by dopamine B-oxidase form

A

Norepinephrine

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13
Q

Formatiom of sarcosine from dimethylglycine is cataluzed by

A

Flavoprotein dimethylglucine dehydrogenase

It requires reduced pteropentaglutamate

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14
Q

Formed during catabolism of uracil

A

B-alanine

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15
Q

Formed during catabolism of thymine

A

B-aminoisobutyrate

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16
Q 
Which among the following is not the function of B-alanyl dipeptides carnosine and anserine
A. Activate myosin ATPase
B. Chelate copper
C. Enhance copper uptake
D. None of the above
A

D.

17
Q

Enzyme used for formation of GABA

A

L-glutamate decarboxylase

18
Q

Transamination of y-aminobutyrate forms

A

Succinate semialdehyde
Reduced-hydroxybutyrate
Oxidized-succinate

biochemistry endo (5 decks)

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