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What molecule is used by all living organisms to transfer energy within cells?
ATP (adenosine triphosphate).
What are the three components of an ATP molecule?
Adenine (nitrogenous base), ribose (5-carbon sugar), and three phosphate groups.
Why is ATP called the "universal energy currency"?
It’s exchanged for energy in many cellular processes like transport, movement, and synthesis.
What happens when ATP binds to a transport protein in active transport?
The third phosphate is released, transferring energy to move substances across the membrane.