ATP : An Overview MCQ - Practice Questions with Answers

ATP (Adenosine Triphosphate)

• ATP is a nucleotide molecule.
• Adenosine is made up of adenine and ribose.
• Triphosphate stands for three phosphate groups that are attached together as well as to the ribose sugar. 
• ATP is a high energy molecule and is considered as the energy currency of the cell.
• This is so because the last two phosphate bonds are highly unstable and easily broken.
• The terminal phosphate bond of ATP is hydrolyzed to produce ADP (Adenosine diphosphate) and a phosphate molecule.
• The process of formation of ATP is called phosphorylation.
• It occurs during the light reaction of photosynthesis and cellular respiration.
• The energy released is used in the energy-requiring reaction of the metabolism.  
• For example, the energy required for the synthesis of macromolecules, such as carbohydrates and proteins, is derived from ATP breakdown.
• ATP also supplies the energy for muscle contraction and nerve impulse conduction.