Which amino acids are glucogenic and which are ketogenic? Provide two examples of each.

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Multiple Choice

Which amino acids are glucogenic and which are ketogenic? Provide two examples of each.

Amino acids are grouped by what their breakdown products can be used for: making glucose in gluconeogenesis or forming ketone bodies. Glucogenic amino acids are converted into substrates that feed into gluconeogenesis, such as pyruvate or TCA cycle intermediates. For example, alanine is directly transaminated to pyruvate, which can then be converted into glucose. Glutamate can be converted to α-ketoglutarate, another TCA intermediate that supports glucose production. Ketogenic amino acids give rise to acetyl-CoA or acetoacetyl-CoA, which can form ketone bodies rather than glucose. Classic examples are leucine and lysine, which predominantly contribute to ketone body formation. Some amino acids can be both glucogenic and ketogenic, depending on metabolic conditions (for instance, phenylalanine, tyrosine, tryptophan, isoleucine, and threonine). Two clear examples to remember are: glucogenic—alanine and glutamate; ketogenic—leucine and lysine.

Amino acids are grouped by what their breakdown products can be used for: making glucose in gluconeogenesis or forming ketone bodies.

Glucogenic amino acids are converted into substrates that feed into gluconeogenesis, such as pyruvate or TCA cycle intermediates. For example, alanine is directly transaminated to pyruvate, which can then be converted into glucose. Glutamate can be converted to α-ketoglutarate, another TCA intermediate that supports glucose production.

Ketogenic amino acids give rise to acetyl-CoA or acetoacetyl-CoA, which can form ketone bodies rather than glucose. Classic examples are leucine and lysine, which predominantly contribute to ketone body formation.

Some amino acids can be both glucogenic and ketogenic, depending on metabolic conditions (for instance, phenylalanine, tyrosine, tryptophan, isoleucine, and threonine).

Two clear examples to remember are: glucogenic—alanine and glutamate; ketogenic—leucine and lysine.

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