Question

Which of the following pair is more related? B. A. NH2 NH2 H3C Н,с. H- Н н 'N' N- H. Н Н thymine adenine thymine cytosine D. C. NH2 Н. HN HN O. Н N. H,N H,N H. H. uracil adenine guanine guanine

Answer 1

ANSWER :)

Substituted Watson-Crick guanine-cytosine (GC) base pairs were recently shown to yield robust three-state nanoswitches. Here, we address the question: Can such supramolecular switches also be based on Watson-Crick adenine-thymine (AT) base pairs? We have theoretically analyzed AT pairs in which purine-C8 and/or pyrimidine-C6 positions carry a substituent X=NH(-), NH(2), NH(3) (+) (N series), O(-), OH or OH(2) (+) (O series), using the generalized gradient approximation (GGA) of density functional theory at the BP86/TZ2P level