What is the relationship between the energy content of a photon and the wavelength of light? How does the wavelength of light determine whether it will stimulate photosynthesis? How do the absorbance properties of photosynthetic pigments determine the direction in which energy is transferred within a photosynthetic unit?

What is the relationship between the energy content of a photon and the wavelength of light? How does the wavelength of light determine whether it will stimulate photosynthesis? How do the absorbance properties of photosynthetic pigments determine the direction in which energy is transferred within a photosynthetic unit?

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter20: The Protists

Section: Chapter Questions

Problem 4CT: Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of...

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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?
What are the two places where light energy is required in the light reaction of photosynthesis? Why must energy be supplied at precisely these points?
Which of the mechanisms for dissipating light energy shown in Fig. would best protect the photosystems from excess light energy?
Which color light waves best at carrying out photosynthesis?
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)?
Which pigments provide the maximum efficiency for a plant as itconducts photosynthesis?
When electrons are removed from water, protons are liberated. Does this occur in the stroma or inside the thylakoid lumen? Can protons move directly across the membrane? Describe the chemiosmotic mechanism of ATP synthesis in chloroplasts.
Which photosystem is involved in cyclic photophosphorylation?
Briefly explain the light-dependent reactions of photosynthesis: where does this take place, what are the reactants and what is produced?
Diagram 4: The Light Reactions of Photosynthesis STROMA dow concentralion Photonystem B Cytch e Photosystem Light omplex Light NADP reductoe NADP NADPH THYLAKOID SPACE igh ooncentration) Cavin Cyle Thylakid menbrane ATP STROMA ow H eone sythase ADP ATP Diagram 4 shows a single thylakoid membrane taken from a chloroplast inside of a leaf cell. The events of the light dependent cycle that take place along the thylakoid membrane are shown. Light energy is captured by O ATP synthase O Photosystems I and II O NADP+ reductase The thylakoid membrane's lipid structures Drovious
Identify the chemical basis for ApH and AY across the chloroplast thylakoid membrane by dragging the descriptions to their targets. Be sure to notice that the upper arrow iindicates ApH and the lower arrow indicates ΔΨ. ATP synthase complex H+ N ADP + P₁ Light energy ATP H*N Photosystem I/II- Chloroplast N side Aus PN ApH T + Thylakoid membrane HTp H+p Lumen Stroma P side Proton circuit A B High H concentration Low positive charge High positive charge Low H+ concentration Within the image, identify the types of proton translocation by dragging each label to its target. O XH₂ 2H+ + Z 2 H* ZH₂ O XH₂ Z 2H+ ZH₂ 2H+ C A B Proton pump Redox loop
In chloroplasts, protons are pumped out of thestroma across the thylakoid membrane, whereas in mito-chondria, they are pumped out of the matrix across thecrista membrane. Explain how this arrangement allowschloroplasts to generate a larger proton gradient acrossthe thylakoid membrane than mitochondria can generateacross the inner membrane.