AAMC FL Practice Exam

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Study for the AAMC FL Exam. Prepare with comprehensive flashcards and multiple-choice questions, each equipped with hints and explanations. Gear up for your medical school entrance exam!

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What type of structure do purines, such as adenine and guanine, have?

  1. One cyclic structure

  2. Two cyclic structures

  3. Three cyclic structures

  4. Linear structures

The correct answer is: Two cyclic structures

Purines, including adenine and guanine, are characterized by their unique double-ring structure, which consists of two fused cyclic (ring) structures. This dual-ring formation is distinctive to purines and distinguishes them from pyrimidines, which have a single ring structure. Each of the rings in purines contributes different atoms to the overall molecular structure, leading to the characteristic properties and functions of purines in biological systems, such as their roles in RNA and DNA synthesis. Thus, the identification of purines as having two cyclic structures is fundamental to understanding their chemistry and function in nucleic acids.

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