Multiple Choice
In the context of Gibbs free energy and ATP hydrolysis, which set correctly describes the three structural components of an ATP molecule?
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1. Introduction to Biochemistry
Gibbs Free Energy
Multiple Choice
In the context of Gibbs free energy and ATP hydrolysis, how many phosphate groups does adenosine triphosphate (ATP) contain?
A
One phosphate group
B
Four phosphate groups
C
Three phosphate groups
D
Two phosphate groups
Verified step by step guidance1
Recall the chemical structure of adenosine triphosphate (ATP). ATP consists of an adenosine molecule attached to a chain of phosphate groups.
The term 'triphosphate' in ATP indicates the number of phosphate groups present. 'Tri-' means three, so ATP has three phosphate groups linked together.
These phosphate groups are connected by high-energy phosphoanhydride bonds, which are important for energy transfer in biochemical reactions.
Understanding the name and structure helps identify that ATP contains exactly three phosphate groups, not one, two, or four.
Therefore, the correct answer is that ATP contains three phosphate groups.
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