Multiple Choice
The total ATP produced from one glucose molecule during cellular respiration is often cited as 38. Why is the net ATP yield typically considered to be only 30?
33. The Organic Chemistry of Metabolic Pathways
ATP and Energy
Multiple Choice
Which of the following reactions directly provides chemical energy for most cell functions?
A
Hydrolysis of ATP to ADP and inorganic phosphate
B
Formation of peptide bonds during protein synthesis
C
Conversion of glucose to glycogen
D
Oxidation of NADH to NAD+
Verified step by step guidance1
Understand the role of ATP in cellular processes: ATP (adenosine triphosphate) is the primary energy carrier in cells. Its hydrolysis releases energy that can be used for various cellular functions.
Examine the hydrolysis of ATP: The reaction involves breaking the bond between the second and third phosphate groups in ATP, forming ADP (adenosine diphosphate) and inorganic phosphate (Pi). This process releases energy.
Compare the energy release in ATP hydrolysis with other reactions: Formation of peptide bonds, conversion of glucose to glycogen, and oxidation of NADH to NAD+ are important biochemical processes, but they do not directly provide energy in the same immediate way as ATP hydrolysis.
Consider the role of ATP hydrolysis in energy coupling: ATP hydrolysis is often coupled with endergonic reactions in the cell, providing the necessary energy to drive these processes forward.
Conclude that ATP hydrolysis is the direct source of chemical energy for most cell functions: While other reactions are crucial for metabolism and energy storage, ATP hydrolysis is the immediate source of energy for cellular activities.
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