Purines include:
Correct answer: C. Adenine and guanine
- A. Adenine and cytosine
- B. Adenine and thymine
- C. Adenine and guanine
- D. Adenine and uracil
Explanation
The correct answer is Adenine and guanine. Both adenine and guanine are purines, which are characterized by a two-ring structure. Purines are larger nitrogenous bases compared to pyrimidines, which have a single-ring structure. The other options include one purine and one pyrimidine, which makes them incorrect in identifying purines exclusively.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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