15. Which of the following is an essential amino acid?
16. Protein fluorescence arises primarily from which residue?
17. Which of the following amino acid is known as half-cystine residue?
18. Which of the following is not an essential amino acid?
19. Which of the following is not a sensible grouping of amino acids based on their polarity properties?
20. Proteins and macromolecular structures take on their higher order structures
21. What is the product of the catabolic breakdown of Alanine?
