AP BIOLOGY

CELL RESPIRATION

ATP ADENOSINE TRIPHOSPHATE

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Brent draws the structure of ATP out on his paper. He must indicate which bond between the three phosphate groups becomes broken and/or attached. Which phosphate group break off and/or attach?

A	phosphate closest to adenosine
B	the middle phosphate group
C	the phosphate group at the end

Explanation:

Detailed explanation-1: -The hydrolysis of ATP breaks the bond between the two outer phosphate groups. This releases the outermost phosphate group along with the free energy that was stored in this bond to produce a molecule of adenosine diphosphate, often shortened to ADP.

Detailed explanation-2: -ATP is the “stored” energy form, which can release energy by breaking a chemical bond between the last two (2) phosphate groups, thus becoming ADP. Cells can store only small amounts of ATP at any time. can be restored to ATP by adding one (1) more phosphate group to the 2 existing phosphates.

Detailed explanation-3: -ATP is an excellent energy storage molecule to use as “currency” due to the phosphate groups that link through phosphodiester bonds. These bonds are high energy because of the associated electronegative charges exerting a repelling force between the phosphate groups.

Detailed explanation-4: -Hydrolysis of ATP Removing or adding one phosphate group interconverts ATP to ADP or ADP to AMP. Breaking one phosphoanhydride bond releases 7.3 kcal/mol of energy.

There is 1 question to complete.