Question

Which of the following is NOT true about pyrimidines and purines? please justify your answer

Select one or more:

O a. Purines have a two ring nitrogenous base

b. Purines and pyrimidines bind together using hydrogen bonds

O c. Pyrimidines have a two-ring nitrogenous base

d. Purines always bind to pyrimidines when a DNA helix is formed

e. Purines and pyrimidines make up the "rungs" of the DNA ladder​

Answer 1

C.pyrimidines have a two-ring nitrogenous base

Answer 2

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Pairing of a specific purine to a pyrimidine is due to the structure and properties of these bases. ... In DNA base pairing, A pairs with T and C with G. Matching base pairs ( purines and pyrimidines ) form hydrogen bonds. A and T have two sites where they form hydrogen bonds to each other