9700 · 12.1
Energy flashcards
Revision flashcards for Cambridge 9700 Energy (syllabus 12.1). Flip, recall, then mark a real past-paper question.
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What is the full name of ATP?
Adenosine Triphosphate.
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What are the three components of an ATP molecule?
1. Adenine (a nitrogenous base) 2. Ribose (a five-carbon sugar) 3. Three phosphate groups
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Write the balanced chemical equation for the hydrolysis of ATP.
ATP + H₂O → ADP + Pᵢ + Energy
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What is the name of the enzyme that catalyses the synthesis of ATP during chemiosmosis?
ATP synthase.
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What is phosphorylation?
The addition of a phosphate group to a molecule. For example, the formation of ATP from ADP and an inorganic phosphate (Pᵢ).
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Name two cellular processes that require energy from ATP hydrolysis.
Any two from: Active transport, muscle contraction, synthesis of macromolecules (e.g., proteins), nerve impulse transmission, cell division.
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Approximately how much energy is released by the hydrolysis of one mole of ATP to ADP + Pᵢ?
Approximately 30.5 kJ mol⁻¹.
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What is the role of NAD and FAD in cellular respiration?
They are coenzymes that act as hydrogen/electron carriers. They accept high-energy electrons and protons from metabolic pathways (like the Krebs cycle) and transfer them to the electron transport chain to generate ATP.