Question

Why is atp important in biochemical reactions?

Answer 1

ATP is required in many metabolic activities such as active transport, generating energy for proper functioning of the body etc etc. 
Hydrolysis of ATP releases energy (ATP + H2O --> ADP + P + energy) 
Most of the ATP in eukaryotic cells of animals is made inside cellular organelles called mitochondria from the oxidation of glucose, a process called cellular respiration. Glucose combines with oxygen (oxidation), forming carbon dioxide, water and 38 molecules of ATP.

Answer 2

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The reactions undergoing inside a living cell to substain life are called biochemical reactions.