Concept explainers
(a)
Interpretation: To classify serine as (1) ketogenic, (2) glucogenic, or (3) both ketogenic and glucogenic.
Concept introduction: Genicity of an amino acid is defined as whether the carbon skeleton degradation product of an amino acid can produce glucose or
An amino acid is known as a glucogenic amino acid if its carbon-containing degradation product can be used to produce glucose. An amino acid is known as a ketogenic amino acid if its carbon-containing degradation product can be used to produce ketone bodies.
There are 20 standard amino acids. Each amino acid has a different carbon skeleton and has a different degradation pathway for its carbon skeleton. The degradation pathways for different amino acids merge in between and result in the formation of only 7 products. The 7 products are
(b)
Interpretation: To classify tyrosine as (1) ketogenic, (2) glucogenic, or (3) both ketogenic and glucogenic.
Concept introduction: Genicity of an amino acid is defined as whether the carbon skeleton degradation product of an amino acid can produce glucose or ketone bodies or not.
An amino acid is known as a glucogenic amino acid if its carbon-containing degradation product can be used to produce glucose. An amino acid is known as a ketogenic amino acid if its carbon-containing degradation product can be used to produce ketone bodies.
There are 20 standard amino acids. Each amino acid has a different carbon skeleton and has a different degradation pathway for its carbon skeleton. The degradation pathways for different amino acids merge in between and result in the formation of only 7 products. The 7 products are
(c)
Interpretation: To classify tryptophan as (1) ketogenic, (2) glucogenic, or (3) both ketogenic and glucogenic.
Concept introduction: Genicity of an amino acid is defined as whether the carbon skeleton degradation product of an amino acid can produce glucose or ketone bodies or not.
An amino acid is known as a glucogenic amino acid if its carbon-containing degradation product can be used to produce glucose. An amino acid is known as a ketogenic amino acid if its carbon-containing degradation product can be used to produce ketone bodies.
There are 20 standard amino acids. Each amino acid has a different carbon skeleton and has a different degradation pathway for its carbon skeleton. The degradation pathways for different amino acids merge in between and result in the formation of only 7 products. The 7 products are
(d)
Interpretation: To classify histidine as (1) ketogenic, (2) glucogenic, or (3) both ketogenic and glucogenic.
Concept introduction: Genicity of an amino acid is defined as whether the carbon skeleton degradation product of an amino acid can produce glucose or ketone bodies or not.
An amino acid is known as a glucogenic amino acid if its carbon-containing degradation product can be used to produce glucose. An amino acid is known as a ketogenic amino acid if its carbon-containing degradation product can be used to produce ketone bodies.
There are 20 standard amino acids. Each amino acid has a different carbon skeleton and has a different degradation pathway for its carbon skeleton. The degradation pathways for different amino acids merge in between and result in the formation of only 7 products. The 7 products are
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