Question

77. Of the following, which occurs during the Calvin cycle? a) Excited electrons are conveyed from chlorophyll to an electron acceptor b) Light energy is converted to chemical energy C) ATP and NADPH are synthesized d) Photons are absorbed e) CO2 is reduced 78. Which of the following occurs during the Calvin cycle? a) Linear electron flow produces the materials required for the fixation of carbon from carbon dioxide. b) Light energy is converted to chemical energy c) ATP is reduced and NADPH is oxidized d) ATP is oxidized and NADPH is reduced e) ATP is hydrolyzed and NADPH is oxidized 79. In the Calvin cycle, CO2 is combined with a) a seven-carbon compound to form two four-carbon compounds b) a two-carbon compound to form a three-carbon compound c) two two-carbon compounds to form a five-carbon compound d) a five-carbon compound to form an unstable six-carbon compound, which decomposes into two three-carbon compounds e) a five-carbon compound to form a stable six-carbon compound that can be converted directly to glucose 80. Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements is most accurate regarding this compound? a) It is produced from glucose during glycolysis b) For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP c) It is a three-carbon sugar d) For every three molecules of CO2 reduced in the Calvin cycle, six molecules of G3P are formed but only one of these molecules exits the cycle to be used by the plant cell e) All of the listed responses are correct 81. Which of the following statements correctly describes the relationship between the light reactions and the Calvin cycle? a) The light reactions produce ADP and NADP+, both of which are used in the Calvin cycle b) The light reactions produce carbon dioxide, ATP, and NADPH, all of which are used in the Calvin cycle c) The light reactions produce ATP and NADPH, both of which are used in the Calvin cycle d) The light reactions produce water, ATP, and NADPH, all of which are used in the Calvin cycle e) The light reactions produce carbon dioxide and water, both of which are used in the Calvin cycle 82. You have a large, healthy philodendron that you carelessly leave in total darkness while you are away on vacation. You are surprised to find that it is still alive when you return. What has the plant been using for an energy source while in the dark? a) Even though the plant received no visible light, it was able to use the short-wave part of the electromagnetic spectrum (gamma rays & X-rays) to carry out photosynthesis b) Even though it cannot carry out the light reactions, the plant can still produce sugars because the Calvin cycle does not require light. c) While it did have access to light, the plant stored energy in the form of sugars or starch, and it was able to derive energy from the stored molecules during your vacation d) When light energy is not available, plants can derive energy from inorganic molecules e) None of the listed responses is correct

Answer 1

Answer:

77). E). CO2 is reduced

Explanation:

During Calvin cycle, CO2 is reduced to glucose by using ATP &NADPH produced in light reaction of photosynthesis.

78). E). ATP is hydrolyzed and NADPH is oxidized

79). d). a five-carbon compound to form an unstable six-carbon compound, which decomposes into two three-carbon compounds.

Explanation:

CO2 is combined with a five-carbon compound called RUBP to form an unstable six-carbon compound, which decomposes into two three-carbon compounds called phosphoglycerate (PGA).

80). D). For every three molecules of CO2 reduced in the Calvin cycle, six molecules of G3P are formed but only one of these molecules exists the cycle to be used by the plant cells.

81). C). The light reaction produce ATP and NADPH, both of which are used in the Calvin cycle

Explanation:

Light reaction produces ATP, NADPH and O2. The ATP and NADPH are called as assimilatory power, which is used to reduce CO2 into glucose.

82). B). Even though it cannot carry out the light reactions, the plant can still produce sugars because the Calvin cycle does not require light.