Nucleotide that is the primary source of energy to cells.

Nucleotide that is the primary source of energy to cells.

• A. Adenosine diphosphate (ADP)
• B. Guanosine triphosphate (GTP)
• C. Cytidine triphosphate (CTP)
• D. Adenosine triphosphate (ATP)

Answer: (D)

Energy in cells is carried by ATP, the molecule that serves as the cell’s main energy currency. When energy is needed, ATP is hydrolyzed to ADP and inorganic phosphate, releasing a burst of energy that powers countless processes—from muscle movement and active transport to driving biosynthetic reactions. The beauty of ATP lies in its ability to be quickly regenerated from ADP and Pi using energy harvested from food or light, keeping a steady supply for immediate use. Other nucleotides like GTP play important roles in specific pathways (for example, signaling or protein synthesis), but ATP is the most versatile and widely used energy source across cellular activities.

Energy in cells is carried by ATP, the molecule that serves as the cell’s main energy currency. When energy is needed, ATP is hydrolyzed to ADP and inorganic phosphate, releasing a burst of energy that powers countless processes—from muscle movement and active transport to driving biosynthetic reactions. The beauty of ATP lies in its ability to be quickly regenerated from ADP and Pi using energy harvested from food or light, keeping a steady supply for immediate use. Other nucleotides like GTP play important roles in specific pathways (for example, signaling or protein synthesis), but ATP is the most versatile and widely used energy source across cellular activities.