what happens to light energy from light reactions
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- Here the electron may be accepted by an electron acceptor molecule of an electron transport chain (see Fig. 3) where the light energy is converted to chemical energy by chemiosmosis (def). The most common light-dependent reaction in photosynthesis is called noncyclic photophosphorylation. Noncyclic photophosphorylation involves both Photosystem I and Photosystem II and produces ATP and NADPH.
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- Light dependent Reactions. Light dependent reactions occur in the thylakoid membrane of the chloroplasts and take place only when light is available. During these reactions light energy is converted to chemical energy. 1  Chlorophyll and other pigments absorb energy from sunlight.2  Water is used to provide electrons and hydrogen ions but also produces oxygen. 3  The electrons and hydrogen ions are used to create ATP and NADPH.et’s take a look at how these are collected by plants. 1  Carbon dioxide from the air passes through small pores (holes) in the leaves. 2  Water is absorbed by the roots and passes through vessels in the stem on its way to the leaves. 3  Sunlight is absorbed by a green chemical in the leaves.
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Light-independent reactions The light-independent Calvin cycle uses the energy from short-lived electronically excited carriers to convert carbon dioxide and water into organic compounds that can be used by the organism (and by animals that feed on it). This set of reactions is also called carbon fixation.
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Dark Reactions of Photosynthesis: The Calvin-Benson Cycle Video: Dark Reactions of Photosynthesis: The Calvin-Benson Cycle. Photosynthesis starts out using the energy from sunlight to get things started, but it ends with the dark reactions, which don't need sunshine to complete sugar production. In the Calvin cycle, ATP and NADPH from the light reactions are used to produce sugars.
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- The second set of reactions goes by a number of names--light independent reactions, dark reactions, or the Calvin cycle. Basically, this is where the chemical energy (ATP and electrons) generated in the light reactions is used to glue carbon atoms together to make glucose.
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- Light reactions need light to produce organic energy molecules (ATP and NADPH). They are initiated by colored pigments, mainly green colored chlorophylls. Dark reactions make use of these organic energy molecules (ATP and NADPH). This reaction cycle is also called Calvin Benison Cycle, and it occurs in the stroma. ATP provides the energy while NADPH provides the electrons required to fix the CO2(carbon dioxide) into carbohydrates. NOTES.
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Light-Dependent Reactions of Photosynthesis Combining Algal and Plant Photosynthesis Light-Dependent Reactions of Photosynthesis The first major set of processes in photosynthesis, in which light energy is initially converted into chemical energy as ATP and NADPH, takes place across the chloroplast thylakoid membranes, between the chloroplast stroma and the thylakoid space.
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Endothermic and Exothermic Reactions Light: If light energy is being given off, then the reaction will glow. If it's being stored, then the reaction will seemingly proceed on its own without any catalyst present without any heat being evolved or absorbed.
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Light-Dependent Reactions of Photosynthesis Thus, the light-dependent reactions can be summarised as the harnessing of light energy to drive electron transport and proton pumping, in order to convert the light energy into a biologically usable form (ATP) and to produce a biologically usable source of reducing power (NADPH).
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Human Physiology/Print Version Two high-energy molecules that are produced during the light reactions are adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADP-H). These two molecules temporarily store energy; they transfer energy into carbohydrates being produced during the light independent reactions (= Calvin cycle).
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Biology book1 All the reactions of photosynthesis that are directly dependent upon light are known as the light reactions. The light reactions occur in the part of the cell known as the thylakoids (Stacks of thylakoids are known as grana.). Many chlorophyll molecules are found embedded into the membranes of the thylakoids. The purpose of the light reactions is to convert light energy into chemical energy in the form of ATP & NADPH. ATP & NADPH are energy carriers. They carry energy to the 2nd part of photosynthesis, known as the dark reactions.
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NADPH the light reactions. Footnote to. Detail #4 ... The electrons from the electron transport chain combine with these H+ ions and nicotinamide adenine dinucleotide phosphate ion s (NADP+) to form adenosine triphosphate (ATP) and a reduced unit of NADP+, called ~ (NADP plus an electron, or H).
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- The exergonic (def) light-dependent reactions of photosynthesis convert light energy into chemical energy, producing ATP and NADPH. These reactions occur in the thylakoids of the chloroplasts.
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Critical Thinking Questions The products of the light dependent reaction are used to power the Calvin cycle to produce glucose. When photons strike photosystem (PS) I, pigments pass the light energy to chlorophyll, molecules that excite electrons, which is then passed to the electron transport chain.
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- Click to read more below. The femur, or thigh bone, is the longest, heaviest, and strongest bone in the entire human body. All of the body’s weight is supported by the femurs during many activities, such as running, jumping, walking, and standing.xtreme forces also act upon the femur thanks to the strength of the muscles of the hip and thigh that act on the femur to move the leg. The femur is classified structurally as a long bone and is a major component of the appendicular skeleton....
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Photosynthesis NADP + + 2e-+ 2H + NADPH + H + The light-independent reactions, a light-independent series of reactions which occur in the stroma of the chloroplasts, when the products of the light reaction, ATP and NADPH, are used to make carbohydrates from carbon dioxide (reduction); initially glyceraldehyde 3-phosphate (a 3-carbon atom molecule) is formed.
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Light-Independent Reactions of Photosynthesis For the sake of consistency with most textbooks and for ease of stoichiometry (making the numbers of atoms add up), we shall skip this and continue to state glucose as the end product. So far (in the light-dependent reactions) however, we have only produced ATP and NADPH. The subsequent reactions leading to the formation of glucose do not directly involve the harnessing of light energy (that has already been done to produce ATP and NADPH), and are therefore called light-independent.
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Photosynthesis: The Light Reaction and Products Simplified The light reaction and its products are an important step in photosynthesis. Photosynthesis is the process that harnesses light energy to produce carbohydrates, and is found in over 100,000 plants species on Earth.
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Biology book1 The light reaction is a process by which organisms capture and store radiant energy as they produce oxygen gas. . This energy is stored in the form of chemical bonds of compounds such as NADPH and ATP. The energy contained in both NADPH and ATP is then used to reduce carbon dioxide to glucose.n Photosystem II, the pumping to H ions into the thylakoid and the conversion of ADP + P into ATP is driven by electron gradients established in the thylakoid membrane. The equation is the net result of two processes. One process involves the splitting of water.
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PHOTOSYNTHESIS The first stage of photosynthesis is a series of reactions, known as the light reactions, that takes its name from the fact that light is required. The products of the light reactions are ATP, NADPH, and oxygen. ATP and NADPH are special, energy-storing molecules. The energy stored in these molecules is later used to make glucose, which is the molecule plants use for long-term energy storage. Lets take a closer look at the light reactions.
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Biology book1 Making the world better, one answer at a time. The reaction that requires direct energy of sunlight to make energy carrier molecules is light reaction. The dark reaction that occurs when the products of the light reaction are used to form C-C covalent bonds of carbohydrates.
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- Sometimes energy is released by bond-forming reactions in the form of light. This occurs in most combustion reactions. Living things that glow in the dark-such as fireflies, funguses, and deep sea creatures-produce light without heat, using chemical reactions. A change in volume occurs.
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Photosynthesis Light reactions occur within the thylakoid membranes and covert light energy into chemical energy while producing O2 (oxygen gas) as a waste product. This processes uses sunlight to from ATP from ADP and phosphate, transfers electrons from water to NADP+ to form NADPH, and is produced as a number of redox reactions.
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2.06 The light-dependent reactions convert light energy into chemical energy. This chemical energy is then used in the light-independent reactions to fix carbon dioxide into organic molecules. In photosynthetic eukaryotes such as plants and algae, photosynthesis occurs in specialized structures called chloroplasts.
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- When light is absorbed by one of the pigments in photosystem II, energy is passed inward from pigment to pigment until it reaches the reaction center. There, energy is transferred to P680, boosting an electron to a high energy level (forming P680*).
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BIOLOGY question? The net effect of these steps is to convert light energy into chemical energy in the form of ATP and NADPH. The ATP and NADPH from the light-dependent reactions are used to make sugars in the next stage of photosynthesis, the Calvin cycle. In another form of the light reactions, called cyclic photophosphorylation, electrons follow a different, circular path and only ATP (no NADPH) is produced.