Amino Acid 3-Letter Abbreviations Quiz

1. A peptide sequence contains the label “Cys.” Which amino acid does it identify?

2. You are checking whether leucine was labeled correctly. Which abbreviation should appear?

3. Which three-letter abbreviation should be used for phenylalanine?

4. A technician must distinguish proline from phenylalanine. Which label represents proline?

5. Which sequence token represents serine rather than threonine, tyrosine, or tryptophan?

6. Which abbreviation is used for asparagine?

7. While reading a protein sequence, you encounter “Glu.” Which amino acid is indicated?

8. In the peptide notation Gly–Ala–Ser, which token marks the alanine residue?

9. A researcher needs to label glutamine in a sequence. Which abbreviation should be used?

10. An annotation mistakenly uses Asn for an aspartic acid residue. Which replacement corrects the label?

11. In a sequence annotation, “Ile” refers to which amino acid?

12. Which three-letter abbreviation represents arginine?

13. Which label should be entered for glycine in a three-letter amino acid sequence?

14. A newly synthesized protein sequence begins with “Met.” Which amino acid is shown?

15. A database entry needs the standard abbreviation for lysine. Which label is correct?

16. A sample record lists histidine. Which sequence label belongs in the record?