Photosynthesis Question?

Photosynthesis Question? Topic: Photosynthesisi
May 20, 2019 / By Audrey
Question: The color of light that is LEAST useful to a plant during photosynthesis is A red B blue C green D orange What's the answer please explain
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Best Answers: Photosynthesis Question?

Originally Answered: Photosynthesis question?
a)light reaction- The light-dependent reactions, or photoreduction, is the first stage of photosynthesis, the process by which plants capture and store energy from sunlight. 1. In this process, light energy is converted into chemical energy, in the form of the energy-carrying molecules ATP and NADPH. 2. In the light-independent reactions, the formed NADPH and ATP drive the reduction of CO2 to more useful organic compounds, such as glucose. 3.The light-dependent reactions take place on the thylakoid membrane inside a chloroplast. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions carbon dioxide + water + light energy → carbohydrate + oxygen b) calvin cycle or the light-independent (dark) reactions of photosythesis- Calvin cycle, Calvin–Benson-Bassham (CBB) cycle, reductive pentose phosphate cycle, Dark reactions or C3 cycle is a series of biochemical redox reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It is also known as the light-independent reactions. In the first stage of the Calvin cycle, a CO2 molecule is incorporated into one of two three-carbon molecules (glyceraldehyde 3-phosphate or G3P), using up two molecules of ATP and two molecules of NADPH, both of which were produced in the light-dependent stage. Three steps are involved.1.The enzyme RuBisCO catalyses the carboxylation of ribulose-1,5-bisphosphate, RuBP, a 5-carbon compound, by carbon dioxide (a total of 6 carbons) in a two-step reaction. The product of the first step is enediol-enzyme complex that can capture CO2 or O2. Thus, enediol-enzyme complex is the real carboxylase/oxygenase. The CO2 that is captured by enediol in second step produces a six-carbon intermediate initially that immediately splits in half, forming two molecules of 3-phosphoglycerate, or 3-PGA, a 3-carbon compound[4] (also: 3-phosphoglyceric acid, PGA, 3PGA). 2.The enzyme phosphoglycerate kinase catalyses the phosphorylation of 3-PGA by ATP (which was produced in the light-dependent stage). 1,3-Bisphosphoglycerate (1,3BPGA, glycerate-1,3-bisphosphate) and ADP are the products. (However, note that two 3-PGAs are produced for every CO2 that enters the cycle, so this step utilizes two ATP per CO2 fixed.) 3.The enzyme glyceraldehyde 3-phosphate dehydrogenase catalyses the reduction of 1,3BPGA by NADPH (which is another product of the light-dependent stage). Glyceraldehyde 3-phosphate (also G3P, GP, TP, PGAL) is produced, and the NADPH itself was oxidized and becomes NADP+. Again, two NADPH are utilized per co2 fixed. The next stage in the Calvin cycle is to regenerate RuBP.
Originally Answered: Photosynthesis question?
in light reaction, water, sunglight and chlorophyll is used up. water is broken by sunlight by a process of photolysis. chlorophyll is used to pass electron from one photosystem to another for the sysnthesis of ATP and NADPH2 (electron contains energy as it pass from one photosystem to another. in calvin cycle, co2 and ATP & NADPH2 ( from light dependent reaction) is used up. co2 is used to combine to RuBP found in stroma of choloroplast to form a unstable 6 carbon compound which is immmediately borken down into 2 glycerate-phosphate and in turn into 2 triose phosphate and the 2 trios phosphate can turn into glucose and also to regenerate RuBP so the calvin cycle is an on-going process. Calvin cycle occurs at stroma of chloroplast.

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