Part A What is the role of $$O_2$$ in photosynthesis? View Available Hint(s) $$O_2$$ is a product of the light reactions. $$O_2$$ is a reactant in the light reactions. $$O_2$$ is a reactant in the Calvin cycle. $$O_2$$ is a product in the Calvin cycle. $$O_2$$ is a both a reactant and a product in the Calvin cycle. Submit Provide Feedback
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The question asks about the role of $$O_2$$ (oxygen) in photosynthesis. Photosynthesis is divided into two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle). Show more…
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QUESTION 1 The oxygen that all oxygen-consuming organisms (like you) inhale or take in by diffusion comes from the breakdown of carbon dioxide photosynthesizing organisms the upper atmosphere oxygen containing molecules (such as NO3 and SO4) in the air that are split QUESTION 2 What absorbs light energy in plants? photons Rubisco enzymes chlorophyll QUESTION 3 The light reactions of photosynthesis occur in the ____________ and the carbon reactions (Calvin cycle) occur in the _____________. cytochromes, stroma thylakoid membranes, stroma reaction centers, vacuoles reaction centers, photosystems QUESTION 4 At the end of the light reactions, the energy rich molecules, ATP and NADPH have been produced ATP and NADPH have been used glucose has been produced the chlorophyll molecules have been consumed QUESTION 5 When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by splitting water breaking down ATP removing them from NADPH they are not replaced
Babar A.
Part A - Do the light reactions of photosynthesis depend on the Calvin cycle? The rate of O2 production by the light reactions varies with the intensity of light because light is required as the energy source for O2 formation. Thus, lower light levels generally mean a lower rate of O2 production. In addition, lower light levels also affect the rate of CO2 uptake by the Calvin cycle. This is because the Calvin cycle needs the ATP and NADPH produced by the light reactions. In this way, the Calvin cycle depends on the light reactions. But is the inverse true as well? Do the light reactions depend on the Calvin cycle? Suppose that the concentration of CO2 available for the Calvin cycle decreased by 50% (because the stomata closed to conserve water). Which statement correctly describes how O2 production would be affected? (Assume that the light intensity does not change.) View Available Hint(s) The rate of O2 production would remain the same because the light intensity did not change. The rate of O2 production would decrease because the rate of G3P production by the Calvin cycle would decrease. The rate of O2 production would decrease because the rate of ADP and NADP+ production by the Calvin cycle would decrease. The rate of O2 production would remain the same because the light reactions are independent of the Calvin cycle.
Dominador T.
0.35. The light reactions of photosynthesis supply the Calvin cycle with: A) light energy. B) CO2 and ATP. C) ATP and NADPH. D) sugar and 02. E) H2O and NADPH. Q.36. Cells use a variety of metabolic pathways to construct ATP, but each concludes with the same step. Which of the following describes the final step by which ADP becomes ATP? a. photosynthesis c. carbon fixation b. phosphorylation d. electron transfer Q.37. Photosynthesis and cellular respiration are both complementary and relatively balanced, but early in the history of life on Earth photosynthesis appears to have dominated, as evidenced by the: a. accumulation of atmospheric oxygen. b. declines in historic sea level as photosynthetic organisms consumed water. c. gradual warming of Earth's climate as CO2 slowly accumulated. d. all of the above Q.38. During the process of photosynthesis, plants capture the kinetic energy of moving photons and transform it into potential energy in the form of: a. pyruvate. c. chemical bonds. b. stroma. d. thylakoid disks. Q.39. Which of the following applies to chloroplasts? a. They have an intermembrane space and a matrix. b. They have three membrane-enclosed compartments. c. Unlike mitochondria, they lack a stroma. d. They carry out both photosynthesis and respiration. Q.40. The outcome of the Calvin cycle is the: a. captures of energy from sunlight. b. synthesis of sugars like glucose, fructose, and sucrose. c. production of pyruvate. d. breakdown of complex molecules and the subsequent release of energy.
Syon S.
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