Which of the following is the precursor for auxin?
(a) Phenylalanine
(b) Valine
(c) Tryptophan
(d) Arginine
This question was posed to me in an online quiz.
The question is from Molecules Derived from Amino Acids in portion Lipid Biosynthesis, Biosynthesis of Amino Acids, Nucleotides and Related Molecules of Biochemistry