Asked in PMC Practice Test 28 (2021) 2021Moderate

One of the most important molecule found in living organisms is ATP. What is its major function?

Correct answer: D. Both Options A and B are correct

  • A. Energy source of the cell
  • B. Coenzyme
  • C. Cofactor
  • D. Both Options A and B are correct

Explanation

ATP (adenosine triphosphate) is a molecule that serves as the primary energy source for most cellular processes. It is produced by cells through the process of cellular respiration, which involves the breakdown of glucose and other molecules to release energy. ATP is used to power a wide variety of cellular processes, including muscle contraction, protein synthesis, and the transport of molecules across cell membranes. When ATP is used to power a cellular process, it is broken down into ADP (adenosine diphosphate) and inorganic phosphate, and the energy released is used to drive the process. ATP is then regenerated through the process of cellular respiration, so that it can be used again to power other processes. ATP (adenosine triphosphate) is also considered a coenzyme, which means that it is a molecule that is required for the activity of certain enzymes. Many enzymes require ATP in order to function properly, and ATP can help to facilitate the transfer of energy between different biochemical reactions. In addition, ATP can also act as a signal molecule within cells, helping to regulate a wide variety of cellular processes.

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About Cellular Respiration

Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.

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