AP BIOLOGY

BIOCHEMISTRY

ENZYMES AND METABOLISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Energy is released from ATP when
A
a phosphate group is added
B
adenine bonds to ribose
C
ATP is exposed to sunlight
D
a phosphate group is removed and bonds to another molecule
Explanation: 

Detailed explanation-1: -When one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and ATP is converted to adenosine diphosphate (ADP ). Likewise, energy is also released when a phosphate is removed from ADP to form adenosine monophosphate (AMP).

Detailed explanation-2: -Usually only the outer phosphate is removed from ATP to yield energy; when this occurs ATP is converted to adenosine diphosphate (ADP), the form of the nucleotide having only two phosphates. ATP is able to power cellular processes by transferring a phosphate group to another molecule (a process called phosphorylation).

Detailed explanation-3: -Energy in living organisms is stored in the bonds of ATP molecule. When energy is required by the cell, a phosphate molecule is removed from ATP (Adenosine triphosphate) forming ADP (Adenosine diphosphate).

Detailed explanation-4: -When these high energy bonds between the phosphate groups at the end are broken, energy is released for cells to use and ADP (adenosine diphosphate) forms, with one phosphate group left on its own.

Detailed explanation-5: -The molecule formed after the removal of one phosphate group from the ATP molecule is known as ADP (adenosine diphosphate).

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