Which of the following is NOT a pyrimidine nitrogenous base? A) Adenine B) Thymine C) Cytosine D) Uracil
Understand the Problem
The question is asking us to identify which option does not belong to the group of pyrimidine nitrogenous bases. To solve it, we need to know the classifications of nitrogenous bases as either pyrimidines or purines.
Answer
Adenine
The nitrogenous base that is NOT a pyrimidine is Adenine.
Answer for screen readers
The nitrogenous base that is NOT a pyrimidine is Adenine.
More Information
Adenine is a purine nitrogenous base, while thymine, cytosine, and uracil are pyrimidine bases. Pyrimidines have a single carbon-nitrogen ring, whereas purines have a double ring.
Tips
A common mistake is to confuse purine and pyrimidine bases since they all appear in DNA and RNA contexts. Remember purines (adenine and guanine) have two rings; pyrimidines (cytosine, thymine, uracil) have one.
Sources
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