on pathway. According to a regional scale model, photorespiration currently reduces US soyb vheat yields by 36% and 20%, respectively, and a 5% reduction in photorespiration losses wor h around $500 million yearly in the United States. wou forecast the costs and good advantages of C4 photosynthesis? What factors increase the hood that the benefits will outweigh the expenses in hot, dry areas in the United States?

on pathway. According to a regional scale model, photorespiration currently reduces US soyb vheat yields by 36% and 20%, respectively, and a 5% reduction in photorespiration losses wor h around $500 million yearly in the United States. wou forecast the costs and good advantages of C4 photosynthesis? What factors increase the hood that the benefits will outweigh the expenses in hot, dry areas in the United States?

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter21: Photosynthesis

Section: Chapter Questions

Problem 5P: The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If...

See similar textbooks

Similar questions

The Relative Efficiency of ATP Synthesis in Noncyclic versus Cyclic Photophosphorylation If noncyclic photosynthetic electron transport leads to the translocation of 7 H+/2e- and cyclic photosynthetic electron transport leads to the translocation of 2 H+/e-, what is the relative photosynthetic efficiency of ATP synthesis (expressed as the number of photons absorbed per ATP synthesized) for noncyclic versus cyclic photophosphorylation? (Assume that the CF1CF0-ATP synthase yields 3 ATP/14 H+.)
The 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+
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?
A decrease in entropy occurs during the CO2 uptake phase of the Calvin cycle, as freely moving CO2 molecules become fixed into a carbon skeleton. How can this occur without direct participation by NADPH and/or ATP?
Which part of the Calvin cycle would be affected if a cell could not produce the enzyme RuBIsCO?
What is the molecule that leaves the Calvin cycle to be converted into glucose? a. ADP b. G3P c. RuBP d. 3-PGA
It is believed that the ratio of cyclic photophosphorylation to noncyclic photophosphorylation changes in response to metabolic demands. In each of the following situations, would you expect the ratio to increase, decrease, or remain unchanged? (a) Chloroplasts carrying out both the Calvin cycle and the reduction of nitrite (NO2 -) to ammonia (This process does not require ATP.) (b) Chloroplasts carrying out not only the Calvin cycle but also extensive active transport (c) Chloroplasts using both the Calvin cycle and the C4 pathway
It is believed that the ratio of cyclic photophosphorylation to noncyclicphotophosphorylation changes in response to metabolic demands. Ineach of the following situations, would you expect the ratio to increase,decrease, or remain unchanged?(a) Chloroplasts carrying out both the Calvin cycle and the reduction ofnitrite (NO2-) to ammonia (This process does not require ATP.)(b) Chloroplasts carrying out not only the Calvin cycle but also extensiveactive transport(c) Chloroplasts using both the Calvin cycle and the C4 pathway
Which of the following scenarios does not occur during the reduction phase of the Calvin Cycle? Hide answer choices Each molecule of 3-phosphoglycerate is phosphorylated by ATP to form 1,3-bisphosphoglycerate. Each molecule of 1,3-bisphosphoglycerate is reduced to glyceraldehyde 3-phosphate by the addition of two electrons from NADPH. Glyceraldehyde 3-phosphate is converted into Ribulose bisphosphate. Some of the glyceraldehyde 3-phosphate molecules are used in carbohydrate production.
A decrease in entropy occurs during the CO2 uptake phase of the Calvin cycle, as freely moving CO2 molecules become fixed into a carbon skeleton. How can this occur without direct participation by NADPH and/or ATP?
In the carbon reduction phase of the Calvin cycle, electrons from NADPH are donated to a metabolic intermediate to form G3P molecules. Which statement is NOT true regarding G3P? A. G3P molecules are involved in the regeneration of RuBP. B. G3P molecules affect the activity of the enzyme rubisco. C. G3P molecules have more potential energy than PGA molecules. D. G3P molecules are used to synthesize glucose and other sugars.
Where is the electrochemical gradient located in the chloroplast? Why is it important? Why are the Light Independent Reactions important? Name the 3 stages of the Calvin Cycle? What is the function of ribulose bisphosphate, RUBISCO, glyceraldehyde 3- phosphate in the Calvin Cycle? How much energy is utilized? What is Carbon Fixation? What is Photorespiration? Why is it wasteful? Why are some plants called C4 plants and why are they important? How have they adapted to unfavorable climatic conditions? How do the activities of C4 plants compare with the activities of CAM plants?