Mehler observed that the H 2 O 2 formed in this way does not present an active intermediate in photosynthesis; rather, as a reactive oxygen species, it can be toxic to surrounding biological processes as an oxidizing agent. Sulfur is the reducing agent and oxygen is the oxidizing agent. Now let's try a different oxidizing agent with glucose. Oxidizing agents can be defined as those groups which transfer oxygen atoms to the substrate although it's not true in every case as in many redox reactions, oxidation – reduction takes place in absence of oxygen atoms. Oxidizing Agents. S + O2 --> SO2. That plants resort to cellular respiration may seem a little confusing, as we have always been told that they produce energy by resorting to photosynthesis. Examples of oxidizing agents These oxidizing agents are also called oxygenation reagents or oxygen – atom transfer (OAT) agents. For example, organisms use electron acceptors such as NAD + to harvest energy from redox reactions as in the hydrolysis of glucose: ... MnO 4-is the oxidizing agent in the above reaction. A. it obtains electrons from the oxygen atom in a water molecule, so it must have a stronger attraction for electrons than oxygen has B. it is the molecule that transfers electrons to plastoquinone (Pq) of the electron transfer system Light striking a plant pigment known as chlorophyll initiates a complex series of reactions, many of which involve redox processes complete with movement of electrons. An oxidizing agent can oxidize a particular substance, hence, making them lose or give away electrons. Let's look at another example with a different reducing agent. Oxidizing agents or oxidants: An oxidizing agent or oxidant is a substance which oxidizes the other substance and itself gets reduced. Eg. The common oxidizing agent in this process is molecular oxygen. Electron carriers. Substrate-level vs. oxidative phosphorylation. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced. Generally In Photosynthesis Photosystem II oxidized by using electrons from water molecules directly and got exicited ( that is P680*) Where as P700 will exicited with series of electrons. Oxidizing and Reducing Agents An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. P680+ is said to be the strongest biological oxidizing agent. Oxygen is the oxidizing agent so it is being reduced. Oxidizing and reducing agents are especially crucial in biological processes such as metabolism and photosynthesis. Redox reactions with carbon-containing molecules How do Plants Carry Out Cellular Respiration? ... And in photosynthesis, the reducing agents accompish a task which is essential to our survival. Given its function, why is this necessary? 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