Pearson eText for Biochemistry: Concepts and Connections -- Instant Access (Pearson+)
2nd Edition
ISBN: 9780137533114
Author: Dean Appling, Spencer Anthony-Cahill
Publisher: PEARSON+
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Chapter 15, Problem 5P
The flux of solar energy reaching the Earth's surface is approximately 7 J/ cm2. Assume that all of this energy is used by a green leaf (10 cm2 in area), with maximal efficiency of 35%. How many moles of hexose could the leaf theoretically generate in an hour? Use 600 nm for an average wavelength.
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to solve.
(please type answer not write by hend)
In a photosynthetic investigation, a student measured the following pH of the stroma and the inner thylakoid compartments of spinach leaf cells at the conclusion of the experiment.
Source of Fluid
pH
(mean)
Standard Error of Mean (SEM)
Stroma
8.2
0.75
Inner compartment of thylakoid
5.6
0.35
Describe the stages of photosynthesis. Explain the need for a constant supply of inorganic carbon dioxide.
Chapter 15 Solutions
Pearson eText for Biochemistry: Concepts and Connections -- Instant Access (Pearson+)
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- Light that the chlorophyll-a pigment uses may be measured by the solar-induced fluorescence (650-850nm). This fluorescence caused by the sun and a plant's gross primary output are correlated linearly. Why can solar induced fluorescence be used to infer net photosynthesis?arrow_forwardCalculate the percentage efficiency of a solar PV module whose length is 147 cm and width is 102 cm and produces 201 W maximum power when exposed to 1064 W/m² solar irradiance?arrow_forwardLight that the chlorophyll-a pigment uses may be measured by the solar-induced fluorescence (650-850nm). This fluorescence caused by the sun and a plant's gross primary output are correlated linearly. Why does this reasoning shows that solar induced fluorescence can be used to infer net photosynthesis?arrow_forward
- We perform our measurements for KHP at 281 nm. Would we get the same results for pathlength at 250 nm? What about using chlorophyll at 667 nm? Why might a too high concentration of KHP give erroneous data for measuring pathlength?arrow_forwardGiven the chromatogram of the spinach leaves extract in a normal phase from the experiment you conducted, arrange the components from least polar to most polar. O Carotene, Xanthrophyll, Chlorophyll A, ChlorophyllI B O Chlorophyll B, Chlorophyll A, Carotene, Xanthrophyll O Chlorophyll A, Chlorophyll B, Xanthrophyll, Carotene O Carotene, Xanthrophyll, Chlorophyll B, Chlorophyll Aarrow_forwardTo assess photosynthesis, we relied heavily on a spectrophotometer to measure the color intensity of DCPIP in our solution. We set the spectrophotometer at wavelengths in the visible spectrum. What is the approximate wavelength range (in nm) for the visible spectrum? For example, the ultraviolet spectrum wavelength range is approximately 10-400 nmarrow_forward
- You resuspend 1 ml of of a purified chlorophyll sample in 10 ml of 80% acetone, and determine that the optical density of the solution (at 652 nm) is 0.88. What is the concentration of your original preparation?arrow_forwardIf the energy received by 5 m² area in 330 seconds is 4100KJ. Find the value of Solar constant ?arrow_forwardIf plants described in problem 4 are illuminated by a combination of light of 680 nm and 700 nm, the oxygen production exceeds that of either wavelength alone. Explain.arrow_forward
- DCPIP (2,6-dichlorophenol-indophenol), a blue dye, can act as an electron acceptor and becomes colorless when reduced. A suspension of chloroplasts is prepared, and DCPIP is added to the suspension. The sample is split into two test tubes. One test tube is exposed to light and the other is wrapped in foil (dark control). What would you observe over time comparing the light exposed and the dark control test tubes? A. The sample exposed to light stays blue. The sample kept in the dark turns colorless. B. The sample exposed to light turns colorless. The sample wrapped in foil stays blue. C. Both samples stay blue. D. Both samples turn colorless.arrow_forwardAssume a pH gradient of 4.0 units across a thylakoid membrane, with the lumen more acidic than the stroma.What is the longest wavelength of light that could provide enough energy per photon to pump one proton against this gradient, assuming 20% efficiency in photosynthesis and T = 25 °C?arrow_forwardAssume a pH gradient of 4.0 units across a thylakoid membrane, with the lumen more acidic than the stroma. What is the longest wavelength of light that could provide enough energy per photon to pump one proton against this gradient, assuming a 20% efficiency in photosynthesis and T = 25 °C?arrow_forward
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