Purines and pyrimidines are__________________?
Correct answer: B. Nitrogenous bases
- A. Enzymes
- B. Nitrogenous bases
- C. Carbohydrates
- D. Lipids
Explanation
Purines, adenine and guanine, and pyrimidines, cytosine, thymine and uracil, are nitrogen-containing bases found in nucleic acids. Their ring structures contain nitrogen atoms, distinguishing them from carbohydrates and lipids. Enzymes are proteins, so selecting enzymes confuses a biological function with a chemical class.
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