Single ringed nitrogenous bases are:
Correct answer: B. Pyrimidines
- A. Purine
- B. Pyrimidines
- C. Adenine
- D. Guanine
Explanation
The correct answer is pyrimidines. Pyrimidines are one of the two types of nitrogenous bases found in nucleic acids and are distinguished by their single-ring structure. This group includes cytosine, thymine, and uracil. In contrast, purines, which include adenine and guanine, have a two-ring structure and are not single-ringed. Thus, options A, C, and D are incorrect because they refer to purines, which do not match the single-ring criteria.
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