There are five different ways in which atp can be synthesized. Which one is the correct answer? Substrate-level phosphorylation: This process takes place during cellular respiration and happens when a phosphate group is added to ADP through a series of intermediate reactions that require the input of energy from an exogenous source (from food or sunlight). The addition of this phosphate group creates ATP, meaning substrate-level phosphorylation is also known as ‘phosphagen’ synthesis. Oxidative phosphorylation: This process is the most efficient means for cells to create atp. It takes place in mitochondria, and it’s done by a series of reactions that use sugar molecules as fuel sources with oxygen gas serving as an electron acceptor. The electrons are passed down a chain of proteins called ‘electron transport chains’ where they’re finally accepted by coenzyme Q-cytochrome C reductase (complex II). Complexes I, II, and IV also contribute to this process since they contain enzymes involved in adding phosphate groups onto ADP. However, oxidative phosphorylation tends to be more helpful when there’s plenty of oxygen available because complex II needs those electrons from breathing processes which can’t

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