A) Prokaryotes
B) Guanine
C) Thymine
D) Uracil
Correct Answer: B
Solution :
Nitrogenous bases are of two types-purines and pyrimidines. Purines are 9-membered double ring nitrogen bases, which possess nitrogen at 1, 3, 7 and 9 position, eg, adenine , guanine (G). Pyrimidines are 6-membered nitrogen bases that contain nitrogen at 1 and 3 positions, eg, cytosine , thymine (T), uracil (U).
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