The following molecules are involved in the biosynthetic pathway that leads to the formation of DNA and RNA; what is their correct sequence in this pathway? a. PABA b. tetrahydrofolic acid c. purine and pyrimidine nucleotides d. dihydrofolic acid
1. a, d, b, c
2. a, b, c, d
3. a, c, d, b
4. a, b, d, c