which of the following is NOT a true statement about ATP? A. used ATP is discarded by the cell as waste. B. ATP consists of ribose, adenine and phosphate. C. ADP forms when ATP releases energy. D. ATP provides energy for the mechanical functions of cells.



Answer :

Answer;

C. Used ATP is discarded by the cell as waste.

Explanation;

-ATP is produced during cellular respiration, a process which involves the breakdown of glucose to generate energy in the form of ATP.

-During cellular respiration chemical energy in glucose is converted to ATP which can be used by the cells to drive cellular processes. ATP is a molecule that consist of ribose sugar, adenine, and 3 phosphates. Energy stored in ATP is released by breaking the phosphate bond to form ADP.

The ATP is used as an energy source in the body to perform various functions. When the ATP is utilized it is cleaved into ADP and phosphate with the release of some energy. This ADP can further be broken down into AMP or can again be recycled back to ATP. Therefore, ATP once used is not discarded but utilized again.  

Further Explanation

The ATP is an important molecule of the cell which is accountable for transferring and storing energy. The components namely adenine, three phosphate groups, and ribose sugar together form a molecule of ATP.

The energy stored in the form of ATP can be used to perform the cellular processes by the cell. The energy derived from the sun is stored as ATP by the plants during photosynthesis whereas, the food digested by the animals release energy so as to be stored as ATP.

The phospho-anhydride bonds are the high energy bonds that link the three phosphate groups together in the ATP molecule. The hydrolysis of this bond results in the release of energy along with the formation of adenosine diphosphate (ADP) from ATP. This released energy is utilized by the cell in order to perform the mechanical functions such as the muscles workout or to change an unfavorablereactionintofavorable oneswith the transfer of energy to other molecules.

In a similar way, hydrolysis of ADP results in the removal of one more phosphateto form adenosine monophosphate (AMP), also releasingsome sort of energy. The AMP can again be recycled into ATP or ADP to store energy by the formation of new phospho-anhydride bonds. The AMP, ADP, and ATP get interconverted constantly depending on the need of the cell and their participation in the biological reactions.

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Answer Details:

Grade:  Higher secondary

Subject: Biology

Chapter: Bioenergetics: The Role of ATP

Keywords:

ATP, ADP, AMP, components of ATP, phosphor-anhydride bonds, favorable reactions, unfavorable reactions, hydrolysis of ATP, biological reactions, ribose sugar.