Multiple Choice
Which of the following is classified as a nonpolar molecule?
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1. Introduction to Biochemistry
Chemical Bonds
Multiple Choice
In ATP, where are the “high-energy” bonds located that release energy upon hydrolysis?
A
In the phosphoester bond between the ribose sugar and the phosphate
B
In the hydrogen bonds between ATP and surrounding water molecules
C
In the phosphoanhydride bonds between the phosphate groups (especially between the and phosphates)
D
In the glycosidic bond between adenine and ribose
Verified step by step guidance1
Identify the structure of ATP, which consists of an adenine base, a ribose sugar, and three phosphate groups labeled as alpha (α), beta (β), and gamma (γ) phosphates starting from the ribose sugar outward.
Understand the types of bonds present in ATP: phosphoester bond (between ribose and α-phosphate), phosphoanhydride bonds (between the phosphate groups), glycosidic bond (between adenine and ribose), and hydrogen bonds (between ATP and water molecules).
Recognize that the term 'high-energy bonds' in ATP refers specifically to the phosphoanhydride bonds, which are the bonds between the phosphate groups, especially the bond between the β and γ phosphates.
Recall that hydrolysis of these phosphoanhydride bonds releases a significant amount of free energy, which is utilized by the cell for various biochemical processes.
Conclude that the 'high-energy' bonds are not the phosphoester bond, glycosidic bond, or hydrogen bonds, but the phosphoanhydride bonds between the phosphate groups in ATP.
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