Problem 1: Is threonine an essential or nonessential amino acid in humans and what is the difference?
Problem 2: If threonine is an essential amino acid in humans how is it synthesized in other organisms?
Problem 3: If threonine is nonessential amino acid how is it synthesized in humans?
Problem 4: What are the characteristic features of the R-group of threonine?
Problem 5: Where would threonine normally occur in protein structure and why?
Problem 6: What function might threonine play in enzyme binding and catalysis?
Problem 7: Does threonine have a function as an intermediate in metabolism?
Problem 8: Does threonine serve as a precursor of other biological molecules?