Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 7, Problem 2AC
Summary Introduction
To describe:
Whether the
Introduction:
The chloroplasts are double-membrane bound organelles, which contain pigments known as the chlorophylls, which carry out photosynthesis in the autotrophic organisms. These are present in the mesophyll cells of the leaf. In the stroma of chloroplast, stacks of thylakoids are present which are known as grana. Inside the thylakoids, there are clusters of proteins are photosynthetic pigments present.
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How would you design an experiment to test the following hypothesis:
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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
Ch. 7.1 - What chemical reactions allow plants to capture...Ch. 7.1 - explain why photosynthesis is important?Ch. 7.1 - diagram the structure of leaves and chloroplasts...Ch. 7.1 - write out and explain the basic equation for...Ch. 7.1 - summarize the main events of the light reactions...Ch. 7.2 - You continuously monitor the photosynthetic oxygen...Ch. 7.2 - Prob. 1HYEWCh. 7.2 - What reactions allow plants to store the...Ch. 7.2 - list the light capturing molecules in chloroplasts...Ch. 7.2 - diagram and describe the molecules within the...
Ch. 7.2 - Prob. 3CYLCh. 7.3 - Prob. 1TCCh. 7.3 - describe the function of the Calvin cycle and...Ch. 7.3 - list the three stages of the Calvin cycle,...Ch. 7.3 - describe the fate of the simple sugar G3P...Ch. 7.3 - Prob. 2TCCh. 7.3 - What global policy changes and what individual...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 - Prob. 4MCCh. 7 - Which of the following is False? a. Photosystem II...Ch. 7 - Prob. 1FIBCh. 7 - Chlorophyll a captures wavelengths of light that...Ch. 7 - Prob. 3FIBCh. 7 - Prob. 4FIBCh. 7 - Light reactions generate the energy-carrier...Ch. 7 - Explain what would happen to life if...Ch. 7 - Prob. 2RQCh. 7 - Draw a simplified diagram of a leaf cross-section...Ch. 7 - Draw a simplified diagram of a chloroplast and...Ch. 7 - Prob. 5RQCh. 7 - Prob. 6RQCh. 7 - Suppose an experiment is performed in which plant...Ch. 7 - Prob. 2ACCh. 7 - Assume you want to add an accessory pigment to the...
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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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