Biology CLEP Prep Practice Exam

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What is the main role of the energy-carrying molecule ATP?

  1. Holding genetic information

  2. Accepting energy from other molecules

  3. Providing energy for metabolic reactions

  4. Collecting electrons from other molecules

The correct answer is: Providing energy for metabolic reactions

ATP or adenosine triphosphate is the main energy-carrying molecule in cells. It is often referred to as the "molecular currency" of the cell because it provides the energy needed for various metabolic reactions. The other options are incorrect because A) Holding genetic information is the role of DNA, not ATP. B) Although ATP does accept energy from other molecules, its main role is to provide energy for metabolic reactions. D) Collecting electrons is the role of molecules such as NADH and FADH2, not ATP. Therefore, the correct answer is C because providing energy for metabolic reactions is the primary function of ATP.

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