ATP Cycle | Summary and Q&A

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October 24, 2019
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ATP Cycle

TL;DR

The ATP cycle involves the conversion of adenosine diphosphate (ADP) to adenosine triphosphate (ATP), with energy being absorbed during the process of ADP to ATP conversion and released during the reverse reaction of ATP to ADP.

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Questions & Answers

Q: What is the difference between ATP and ADP?

ATP (adenosine triphosphate) has three phosphate groups, while ADP (adenosine diphosphate) has two phosphate groups. The addition or removal of a phosphate group is essential for energy transfer.

Q: How is energy transferred during the ATP cycle?

Energy is absorbed in the endergonic reaction of converting ADP to ATP. This energy is stored in the phosphate bond. During the exergonic reaction of ATP to ADP, the phosphate bond is broken, releasing energy that can be used for cellular processes.

Q: What is the role of water in the ATP cycle?

Water is involved in the hydrolysis reaction of ATP to ADP. It breaks one of the phosphate bonds, releasing energy. In the reverse reaction, a dehydration synthesis reaction, water is released as a by-product when ATP is synthesized from ADP.

Q: Why is ATP referred to as the energy currency of the cell?

ATP acts as a short-term energy storage molecule. When ATP is converted back to ADP, the stored energy is released and utilized in processes such as active transport, molecule synthesis, and other energy-requiring reactions.

Summary & Key Takeaways

  • ATP is adenosine triphosphate, a molecule with three phosphate groups, while ADP is adenosine diphosphate with two phosphate groups.

  • Converting ADP to ATP requires energy input and is an endergonic reaction, releasing energy during the reverse process.

  • Water is involved in the hydrolysis reaction of ATP to ADP, while ATP synthesis involves a dehydration synthesis reaction.

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