Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 14, Problem 11RQ
Summary Introduction
To review:
1. The differences and common features of photosystem I (PS I) and photosystem II (PS II).
2. The two photosystems combine in the Z pathway.
3. The reason behind the generation of oxygen by the Z pathway while PS I and PS II are not able to do so.
Introduction:
Photosystems are the functional units of photosynthesis that are responsible to carry out absorption and transfer of light energy. Photosystems are of two types, photosystem I and photosystem II. ATP (adenosine triphosphate) is the energy currency of all cells that is produced by these photosystems.
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What is implied about the energyrequirements of photosystems I and II by the fact that there is a difference in the minimum wavelength of light needed for them tooperate (700 nm for photosystem I and 680 nm for photosystem II)?
There are two photosystems ( I and II) involved in the light-dependent reactions of photosynthesis. What is the functional difference between these two photosystems?
Does the diagram represent cyclic or non-cyclic photophosphorylation: ____________________ ? When the reaction center of photosystem II ejects a high energy electron, the electron is replaced by an electron from _______________. When the reaction center of photosystem I ejects an electron, the electron goes to _____________________. What two high energy molecules are produced during the light dependent reactions of photosynthesis: ______________ and _____________?
Chapter 14 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 14.1 - Prob. 1TQCh. 14.1 - Prob. 2TQCh. 14.2 - Prob. 1TQCh. 14.2 - Prob. 2TQCh. 14.2 - Prob. 3TQCh. 14.3 - Prob. 1TQCh. 14.3 - Prob. 2TQCh. 14.3 - Prob. 3TQCh. 14.4 - Prob. 1TQCh. 14.5 - Prob. 1TQ
Ch. 14.5 - Prob. 2TQCh. 14.6 - Prob. 1TQCh. 14 - Prob. 1RQCh. 14 - Prob. 2RQCh. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Prob. 5RQCh. 14 - Prob. 6RQCh. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQCh. 14 - Prob. 11RQCh. 14 - Prob. 1TQCh. 14 - Prob. 2TQCh. 14 - Prob. 3TQCh. 14 - Prob. 4TQ
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- Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?arrow_forwardWhat is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Would photosynthesis be more efficient if their individual absorption spectra coincided exactly?arrow_forwardThe Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+arrow_forward
- Excited electrons (and hydrogen ions) in Photosystem 2 go through an electron transport system, but these electrons (and hydrogen ions) must be replaced in the pigments. How are these electrons (and hydrogen ions) replaced? In other words, what is the ultimate origin of these electrons (and hydrogen ions) and what is the important byproduct of the reaction that provides these electrons (and hydrogen ions)?arrow_forwardBriefly explain the light-dependent reactions of photosynthesis: where does this take place, what are the reactants and what is produced?arrow_forwardSuppose a researcher is carrying out studies in which she adds a nonphysiological electron donor to a suspension of chloroplasts. Illumination of the chloroplasts yields oxidation of the donor. How could she tell whether photosystem I, II, or both are involved?arrow_forward
- ATP is produced by chemiosmosis in photosynthesis". Identify where and how this chemical gradient is formed?how this is driving the ATP synthesis. Mention where the light dependent and light independent reactions of photosynthesis take place along with the functional end product(s) of these two stages. Dark and light reactions of photosynthesis are interconnected, how?arrow_forwardIn cyclic photophosphorylation in photosystem I, ATP is produced, even though water is not split. Explain how the process takes place.arrow_forwardProvide an overview of photosynthesis by describing the purpose of the light and dark reactions. How do the light and dark reaction contribute to photosynthesis? Describe the products and by products of the light reactions and the general concept of the system. What part of the system does the DCPIP substitute?arrow_forward
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