Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 5, Problem 5.2PS
QUANTITATIVE Photosynthetic Energy Transduction. The amount of energy trapped and the volume of carbon converted to organic form by photosynthetic energy transducers are mindboggling: about 5 × 1016 g of carbon per year over the entire Earth’s surface.
(a) Assuming that the average organic molecule in a cell has about the same proportion of carbon as glucose does, how many grams of organic matter are produced annually by phototrophs?
(b) Assuming that all the organic matter in part a is glucose (or any molecule with an energy content equivalent to that of glucose), how much energy is represented by that quantity of organic matter? Assume that glucose has a free energy content (free energy of combustion) of 3.8 kcal/g.
(c) Referring to the answer for Problem 5-1a, what is the average efficiency with which the radiant energy incident on the upper atmosphere is trapped photosynthetically on the Earth’s surface?
(d) What proportion of the net annual phototrophic production of organic matter calculated in part a is used by chemotrophs?
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Chapter 5 Solutions
Becker's World of the Cell (9th Edition)
Ch. 5 - How do phototrophs and chemotrophs depend...Ch. 5 - How does the spontaneity of a chemical reaction...Ch. 5 - QUESTION: Why does the height of the spike get...Ch. 5 - For a chemical reaction happening in a cell, what...Ch. 5 - Prob. 5.1PSCh. 5 - QUANTITATIVE Photosynthetic Energy Transduction....Ch. 5 - Energy Conversion. Most cellular activities...Ch. 5 - Problem Set Enthalpy, Entropy, and Free Energy....Ch. 5 - Violating the Second Law? The second law of...Ch. 5 - QUANTITATIVE The Equilibrium Constant. The...
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