The reaction ADP $+P \rightarrow$ ATP is a(n) __________ reaction.
A. exergonic
B. hydrolysis
C. chemical
D. spontaneous
E. endergonic
Answer (2)
The reaction ADP + P → ATP is classified as an endergonic reaction since it requires energy to form ATP. This process is essential for storing energy in cells. Therefore, the correct option is E. endergonic.
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The reaction ADP + P -> ATP involves combining adenosine diphosphate (ADP) with inorganic phosphate (P) to form adenosine triphosphate (ATP).
The formation of ATP requires energy input to create a new chemical bond.
Endergonic reactions require energy, making the reaction ADP + P -> ATP an endergonic reaction.
Therefore, the reaction is classified as e n d er g o ni c .
Explanation
Understanding the Reaction The reaction ADP + P → ATP is a fundamental process in biology where adenosine diphosphate (ADP) combines with inorganic phosphate (P) to form adenosine triphosphate (ATP). ATP is often referred to as the 'energy currency' of the cell because it stores and transports chemical energy within cells for metabolism.
Energy Requirements To determine the correct classification, we need to understand the energy requirements of the reaction. The formation of ATP from ADP and P requires energy input because a new chemical bond is formed.
Identifying the Reaction Type
Exergonic reactions release energy, while endergonic reactions require energy input. Since the ADP + P → ATP reaction requires energy to form the bond, it is an endergonic reaction.
Eliminating Other Options Hydrolysis involves breaking a bond using water. This reaction is the opposite of hydrolysis, as it forms a bond. A spontaneous reaction occurs naturally without external energy, which is not the case here. While it is a chemical reaction, 'endergonic' is a more specific and accurate classification.
Final Answer Therefore, the reaction ADP + P → ATP is an endergonic reaction.
Examples
Consider a scenario where a student is learning about energy flow in biological systems. Understanding that the synthesis of ATP from ADP and inorganic phosphate requires energy input (endergonic reaction) helps them grasp how cells store energy. This concept is crucial in understanding processes like photosynthesis and cellular respiration, where energy is either captured to produce ATP or ATP is broken down to release energy for various cellular activities. For instance, during muscle contraction, ATP is hydrolyzed to ADP, releasing energy that powers the movement.
