PSI ROS phosphorylated and repr es the 24 hol period in the absence of any light cues. In VIVO in the anobacteria, the phosphorylation of Kaic peaks at night, and this results in the activation of genes coding components of the oxidative pentose phosphate pathway. Daytime photosynthesis KaiA KaiB Kaic NADPH 80 ROS 3 co, fixation and glycogen synthesis +ATP 60 +Mg Detoxification mechanisms 40 20- OPPP NADPH 48 o00 24 72 time (hours) Night-time oxidative pentose phosphate pathway carbon flux O Draw the reactions of the oxidative phase of the pentose phosphate pathway including all reactants d products and enzymes (excluding the final isomerization step). O One hypothesis for why the oxidative pentose phosphate pathway is activated at night is to prepare anobacteria for the accumulation of reactive oxygen species (ROS) generated during the day by the ht-harvesting reactions. Which product of the oxidative pentose phosphate pathway is necessary to mbat reactive oxygen species? What enzyme uses this product to combat ROS and what antioxidant es it generate? Which particular ROS does the antioxidant target via a specific enzyme, and what is e enzyme? What other product does the oxidative pentose phosphate pathway produce, what is it used for, d what daytime activity might production of this product prepare cynobacteria, for? %P-KaiC
PSI ROS phosphorylated and repr es the 24 hol period in the absence of any light cues. In VIVO in the anobacteria, the phosphorylation of Kaic peaks at night, and this results in the activation of genes coding components of the oxidative pentose phosphate pathway. Daytime photosynthesis KaiA KaiB Kaic NADPH 80 ROS 3 co, fixation and glycogen synthesis +ATP 60 +Mg Detoxification mechanisms 40 20- OPPP NADPH 48 o00 24 72 time (hours) Night-time oxidative pentose phosphate pathway carbon flux O Draw the reactions of the oxidative phase of the pentose phosphate pathway including all reactants d products and enzymes (excluding the final isomerization step). O One hypothesis for why the oxidative pentose phosphate pathway is activated at night is to prepare anobacteria for the accumulation of reactive oxygen species (ROS) generated during the day by the ht-harvesting reactions. Which product of the oxidative pentose phosphate pathway is necessary to mbat reactive oxygen species? What enzyme uses this product to combat ROS and what antioxidant es it generate? Which particular ROS does the antioxidant target via a specific enzyme, and what is e enzyme? What other product does the oxidative pentose phosphate pathway produce, what is it used for, d what daytime activity might production of this product prepare cynobacteria, for? %P-KaiC
Biology 2e
2nd Edition
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark
Chapter9: Cell Communication
Section: Chapter Questions
Problem 17RQ: What is the effect of an inhibitor binding an enzyme? The enzyme is degraded. The enzyme is...
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