BIOLOGY: LIFE ON EARTH-W/MASTERING ACCE
2020th Edition
ISBN: 9780135686553
Author: Audesirk
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 2AC
If you were to measure the pH in the space surrounded by the thylakoid membrane in an actively photosynthesizing plant, would you expect it to be acidic, basic, or neutral? Explain your answer.
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How would you design an experiment to test the following hypothesis:
" The optimal temperature for photosynthesis in spinach leaves is 20 degrees Celsius?"
For a given stomatal conductance, how will an increase in atmospheric concentrations of CO2 possibly influence the rate of photosynthesis? How might this affect the water use efficiency of the plant?
Assume 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?
Chapter 7 Solutions
BIOLOGY: LIFE ON EARTH-W/MASTERING ACCE
Ch. 7 - Which of the following is True? a. Photosynthesis...Ch. 7 - The Calvin cycle a. can only occur when light is...Ch. 7 - Prob. 3MCCh. 7 - Carotenoids a. include chlorophylls a and b. b....Ch. 7 - Prob. 5MCCh. 7 - Plant leaves contain pores called _____ that allow...Ch. 7 - Chlorophyll a captures wavelengths of light that...Ch. 7 - 3. During the first stage of photosynthesis, light...Ch. 7 - The oxygen produced as a by-product of...Ch. 7 - 5. In plants, the enzyme that catalyzes carbon...
Ch. 7 - Light reactions generate the energy-carrier...Ch. 7 - Prob. 1RQCh. 7 - Prob. 2RQCh. 7 - 3. Draw a simplified diagram of a leaf...Ch. 7 -
4. Draw a simplified diagram of a chloroplast and...Ch. 7 - Explain photorespiration and why it occurs....Ch. 7 - Trace the flow of energy in chloroplasts from...Ch. 7 - 7. Summarize the events of the Calvin cycle. Where...Ch. 7 - Suppose an experiment is performed in which plant...Ch. 7 - If you were to measure the pH in the space...Ch. 7 - 3. Assume you want to add an accessory pigment to...
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- Which pigments provide the maximum efficiency for a plant as itconducts photosynthesis?arrow_forwardIf a plant begins the process of photosynthesis with 50 kCal worth of light energy, how much energy will be released in the final energy containing products (heat + sugar)? Explain your reasoning.arrow_forwardDescribe why the H+ gradient across a thylakoid membraneis referred to as a storage of energy.arrow_forward
- When a photon of light energy reaches a reaction center chlorophyll molecule, what becomes excited?arrow_forwardA student measures the pH of the stroma and the inner thylakoid compartments of spinach leaf cells. His results are shown in the following table. Explain these results and the difference in pH, using your understanding of the Photosynthetic process.arrow_forwardIn 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 Explain the reason for the differences in pH between the stroma and the thylakoid lumen.arrow_forward
- If a leaf disc is exposed to light but not to CO2, why would it not produce enough O2 to float?arrow_forwardThe first step of the light reactions is the transfer (powered by solar energy) of an electron to the primary electron acceptor within photosystem proteins of the: a. Thylakoid membrane b. Intermembrane space of a chloroplast c. Stroma of a chloroplast d. Cell membrane of a mesophyll cellarrow_forwardDuring photosynthesis, the synthesis of ATP is driven by the flow of H+ from the thylakoid lumen into the stroma via the enzyme ATP synthase. This synthesis of ATP in chloroplast achieved by a chemiosmotic mechanism is specifically called __________.arrow_forward
- Describe the role of ADPH in photosyntesisarrow_forwardIf you could measure pH within a chloroplast, where would it be lowest? a. In the stroma b. In the lumen of the thylakoid c. In the cytoplasm immediately outside the chloroplast d. In the antenna complexarrow_forwardWhere does the Calvin Cycle occur? In the thylakoid membrane In the thylakoid space In the stroma In the intermembrane spacearrow_forward
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY