27. Which of the following is a palindromic sequence? (A) (B) (C)(D) (E)

30. The synthesis of purine and pyrimidine nucleotides differ in that: (A) pyrimidine biosynthesis istightly regulated in the cell, whereas purine biosynthesis is not. (B) ATP is required in thesynthesis of purines but not in the synthesis of pyrimidines. (C) pyrimidines go through manysteps, adding a single carbon or nitrogen each time, whereas the basic skeleton for purines isformed by two main precursors. (D) purine formation requires a THF derivative, whereaspyrimidine formation does not. (E) purine biosynthesis starts with the formation of PRPP,whereas pyrimidines incorporate the PRPP near the end of the pathway.

27. Which of the following is a palindromic sequence?
(A)
(B)
(C)
(D)
(E)

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