L-Lysine Is an Essential Amino Acid and Must Be Supplied

Multiple Choice

L-lysine is an essential amino acid and must be supplied in the diet. By comparison, the stereoisomer D-lysine is not biologically active. Why can your body only utilize one form?

A) Since the L form and D form are enantiomers, they will bind together and inhibit utilization of the D form.
B) Since the L form and D form are chiral molecules, they will bind together and inhibit utilization of the D form.
C) Antibodies recognize the D form and destroy it before your body can use it for nutritional purposes.
D) Enzymes can only recognize a single, specific stereoisomer.