Phosphoribosyl pyrophosphate is a precursor of tryptophan and ____________
(a) Tyrosine
(b) Histidine
(c) Phenylalanine
(d) Isoleucine
This question was addressed to me in final exam.
My doubt is from Biosynthesis of Amino Acids in portion Lipid Biosynthesis, Biosynthesis of Amino Acids, Nucleotides and Related Molecules of Biochemistry