explain light reaction phase of photosynthesis

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Question:The two phase of photosynthesis are the light reaction and the calvin cycle reaction. During the first phase, the short-term energy storage compounds of _________ and _________ are produced by an ___________ transport chain. This begins when electrons are energized by __________ energy. The electrons are provided by a ____________ molecule. ____________ is a by-product of this phase and is released into the atmosphere. During the second phase, the short-term energy storage compounds proved the energy to combine _____________ and ___________ molecules to produce a _____________ molecule through a series of reactions. This phase is also called the ___________ cycle. can someone help me fill in the blanks please.

Answers:in order: ATP and NADPH electron light water oxygen 6 carbon dioxide and six 5-carbon twelve 3-carbon calvin cycle/dark reaction/carbon fixation


Answers:Light-dependent reactions in which light is absorbed, water is split, NADPH and ATP are formed in the grana of the chloroplasts. Light-independent reactions in which carbon dioxide is fixed, NADPH and ATP are used to produce glucose and other biological molecules in the stroma of the chloroplasts.

Question:Here are a few questions which i am not totally sure on. 1)What are the phases of photosynthesis and where do they occur? 2)Why is hydrogen ion generation essential for ATP production during photosnythesis? 3)Why does the Calvin cycle depend on light reactions? 4)How would you explain that oxygen is generated by photosyntheseis is simply a by product formed during the production of ATP and carbs. 5)Predict the effect of the loss of forests on cellular respiration in other organisms. Thanks, -TweedieBrd

Answers:1. The light dependent phase - occurs in the grana of the chloroplasts The light independent phase - occurs in the stroma of the chloroplast. 2. Hydrogen ions set up the electrochenical gradient between the thylakiod space and the stroma for the production of ATP. 3. The Calvin Cycle uses ATP from the light reaction. Once the supply of ATP diminishes the Calvin Cycle slows. 4. The light reactions depend on electrons obtained from the photolysis (splitting) of water to produce ATP for the dark reactions. The photolysis of water produces oxygen as a byproduct. 5. Since plants use CO2 and produce oxygen and animals use oxygen and produce CO2, both are neede for balance. If the forests are lost there will be less oxygen produced and more CO2 produced creating an oxygen deficiency and a problem for organisms that use oxygen.

Question:There are two major products of photosynthesis water and organic substances such as glucose. How would the presence of DPIP (2,6-Dichlorophenol-Indophenol, electron accepting compound) affect the production of oxygen during the light reaction? How would the presence of DPIP affect the production of organic product during the dark reaction? What role did another artificial electron acceptor, ferricyanide, play in elucidating the process of photosynthesis?

Answers:By accepting electrons, DPIP will speed up electron flow, water splitting and oxygen production. DPIP ain't NADPH so I would imagine thed dark rxn would probably be inhibited.

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Photosynthesis: Light Reactions 1 :Details on the light-dependent reactions of photosynthesis

Photosynthesis :Check us out at www.tutorvista.com Photosynthesis is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Photosynthesis occurs in plants, algae, and many species of bacteria, but not in archaea. Photosynthetic organisms are called photoautotrophs, since they can create their own food. In plants, algae and cyanobacteria photosynthesis uses carbon dioxide and water, releasing oxygen as a waste product. Photosynthesis is vital for life on Earth. As well as maintaining the normal level of oxygen in the atmosphere, nearly all life either depends on it directly as a source of energy, or indirectly as the ultimate source of the energy in their food(the exceptions are chemoautotrophs that live in rocks or around deep sea hydrothermal vents). The amount of energy trapped by photosynthesis is immense, approximately 100 terawatts: which is about six times larger than the power consumption of human civilization.As well as energy, photosynthesis is also the source of the carbon in all the organic compounds within organisms' bodies. In all, photosynthetic organisms convert around 100000000000 tonnes of carbon into biomass per year. Although photosynthesis can happen in different ways in different species, some features are always the same. For example, the process always begins when energy from light is absorbed by proteins called photosynthetic reaction centers that contain chlorophylls. In plants, these proteins are held ...