Social Media Management intermediate
Which of the following statements regarding amino acid stereochemistry or metabolic classification is correct?
Answer
All chiral amino acids incorporated into proteins by ribosomes exist as L-stereoisomers.
Explanation
The notes define essential amino acids as those that must be supplied in the diet, describe glucogenic products such as pyruvate and oxaloacetate, and classify tryptophan as both ketogenic and glucogenic. They state that protein amino-acid residues are L-stereoisomers, not D-isomers. **Key takeaway:** Dietary and metabolic classifications describe different amino-acid properties. **Glossary:** Glucogenic: able to yield precursors that can support glucose formation.
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