Which of the following is true about chemical energy?
A. Chemical energy can be stored more efficiently as glucose than it can be as ATP
B. Chemical energy is stored when bonds in ATP are broken to form ADP
C. Chemical energy is released when bonds in ADP are broken to form ATP
D. Chemical energy can only be stored as ADP
A - True.
B - False. ATP -> ADP releases energy.
C - False. ADP -> ATP represents storing energy. (Also you can't "break down" ADP into ATP.)
D - False. Glucose and ADP / ATP can both store energy.
What is true of chemical energy is that chemical energy can be stored more efficiently as glucose than it can be as ATP. All the other answers in this case don't really apply. The correct answer is therefore A.
When ATP is broken down to ADP we get a release of energy - B and C are therefore wrong. Energy is broken in more ways as only ADP - D is also wrong. Only A stays as the correct answer.
a is the correct answer
To determine which of the statements about chemical energy is true, let's analyze each option:
A. Chemical energy can be stored more efficiently as glucose than it can be as ATP. To assess the accuracy of this statement, we need to understand that glucose and ATP are both forms of chemical energy storage within living organisms. Glucose is a simple sugar and a primary energy source, while ATP (adenosine triphosphate) is a molecule that stores and transports energy within cells.
While glucose can be converted to ATP through the process of cellular respiration, it is not accurate to say that chemical energy can be stored more efficiently as glucose. In fact, ATP is considered a more efficient form of energy storage within cells, as it is readily available and can be quickly broken down to release energy.
Therefore, option A is incorrect.
B. Chemical energy is stored when bonds in ATP are broken to form ADP. This statement is accurate. ATP contains high-energy phosphate bonds, and when these bonds are broken by hydrolysis (the addition of water molecules), ATP is converted into ADP (adenosine diphosphate) and inorganic phosphate. The breaking of these bonds releases chemical energy that can be used by cells to perform various functions.
Therefore, option B is correct.
C. Chemical energy is released when bonds in ADP are broken to form ATP. This statement is incorrect. The formation of ATP from ADP and the addition of a phosphate group (phosphorylation) requires the input of energy, typically obtained from the breakdown of glucose or other energy sources. In this process, chemical energy is stored in the newly formed ATP molecule, but it is not released.
Therefore, option C is incorrect.
D. Chemical energy can only be stored as ADP. This statement is incorrect. Chemical energy can be stored in various forms, including molecules like glucose, fats, and ATP. ADP is an intermediate product formed during the hydrolysis of ATP, but it is not the only form in which chemical energy can be stored.
Therefore, option D is incorrect.
In summary, the correct statement about chemical energy is:
B. Chemical energy is stored when bonds in ATP are broken to form ADP.