1. Histidine is degraded to α-ketoglutarate and is described as a

A. gluco amino acid
B. glucogenic amino acid
C. ketogenic amino acid
D. keto-gluco amino acid

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2. Which of the following amino acids is considered as both ketogenic and glucogenic?

A. Valine
B. Tryptophan
C. Lysine
D. None of these

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3. A glucogenic amino acid is one which is degraded to

A. keto-sugars
B. either acetyl CoA or acetoacetyl CoA
C. pyruvate or citric acid cycle intermediates
D. none of the above

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4. Which of the following is the best described glucogenic amino acid?

A. Lysine
B. Tryptophan
C. Valine
D. None of these

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5. A person with phenylketonuria cannot convert

A. phenylalanine to tyrosine
B. phenylalanine to isoleucine
C. phenol into ketones
D. phenylalanine to lysine

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