Multiple Choice
Which of the following statements is true about the energy content of nutrients in biochemical pathways?
33. The Organic Chemistry of Metabolic Pathways
Energy Production in Biochemical Pathways
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Which of the following mechanisms does not generate ATP using an electron transport chain?
A
Oxidative phosphorylation
B
Photophosphorylation
C
Chemiosmosis
D
Substrate-level phosphorylation
Verified step by step guidance1
Understand the concept of ATP generation: ATP (adenosine triphosphate) is the energy currency of the cell, and it can be generated through different mechanisms, including oxidative phosphorylation, photophosphorylation, chemiosmosis, and substrate-level phosphorylation.
Define oxidative phosphorylation: This process occurs in the mitochondria and involves the electron transport chain, where electrons are transferred through a series of complexes, ultimately leading to the production of ATP.
Define photophosphorylation: This process occurs in the chloroplasts during photosynthesis, where light energy is used to drive electrons through an electron transport chain, resulting in the generation of ATP.
Define chemiosmosis: This is a mechanism that involves the movement of ions across a selectively permeable membrane, down their electrochemical gradient, which is coupled to ATP synthesis. It is a key part of both oxidative phosphorylation and photophosphorylation.
Define substrate-level phosphorylation: This is a process of ATP generation that occurs directly in metabolic pathways, such as glycolysis and the citric acid cycle, without the involvement of an electron transport chain.
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