Pick up the smaller nitrogenous base:
Correct answer: C. Cytosine
- A. Purines
- B. Adenine
- C. Cytosine
- D. Guanine
Explanation
The correct answer is Cytosine. Pyrimidines, such as cytosine, thymine, and uracil, have a single-ring structure, making them smaller nitrogenous bases compared to purines, which have a two-ring structure. Cytosine is a pyrimidine, hence smaller than purines like adenine and guanine. The other options, adenine and guanine, are purines and are therefore larger in size.
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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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