Which statement about ATP is true?

• A. ATP is stored in large quantities in the cell.
• B. ATP is the main energy currency of the cell.
• C. ATP is a protein that catalyzes chemical reactions.
• D. ATP is composed of a single phosphate group.

Answer: (B)

Verified step by step guidance

1. Understand that ATP stands for adenosine triphosphate, which is a molecule used by cells to store and transfer energy.
2. Recognize that ATP is not stored in large quantities in the cell because it is constantly being used and regenerated.
3. Identify that ATP is not a protein; it is a nucleotide composed of adenine, ribose (a sugar), and three phosphate groups.
4. Note that ATP is not composed of a single phosphate group; it has three phosphate groups, which is crucial for its role in energy transfer.
5. Conclude that the statement 'ATP is the main energy currency of the cell' is true, as ATP provides energy for many cellular processes.