Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Chapter 31.2, Problem 1CC

If an enzyme in field-grown soybean leaves is most active at noon and least active at midnight, is its activity under circadian regulation?

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When expressing the rate of non-growth as a function of temperature [mu = f(T)], explain what process is required for irreversible inactivation.
The herbicide dinoseb, which was removed from the market many years ago, killed plants by uncoupling oxidative phosphorylation.  Ironically, plants have embedded in the inner membrane of their mitochondria a protein named the “uncoupling protein” that essentially can carry out the same process caused by dinoseb.  The mechanism of uncoupling oxidative phosphorylation involves which of the following scenarios.   A. Excess electrons oxidize lipids in the mitochondrial membranes, thus destroying the electron transport chain     B. Excessive oxygen is consumed via reduction to water, thus depriving the mitochondria of the ability to carry out phosphorylation that requires oxygen     C. The membrane selectivity required to maintain a proton gradient is altered so the potential for driving ATP synthesis via chemiosmosis is degraded   D. Uncoupling oxidative phosphorylation kicks a cell into a fermentative pathway that cannot supply sufficient ATP
Experiments to address the day-night discrepancy in warming (see Pic5) indicate that climate change has inhibited plant growth in warm dry areas more than in cool wet areas. Explain this observation.
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