Which of the following is purine?
Correct answer: A. Guanine
- A. Guanine
- B. Cytosine
- C. Thymine
- D. Uracil
Explanation
Nitrogenous bases are of two types, single ringed pyrimidines and double ringed purines. Pyrimidines are cytosine, thymine, and uracil, while purines are adenine and guanine.
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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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