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Biology

WHAT IF? Explain why a poison that inhibits anenzyme of the Calvin cycle will also inhibit the lightreactions

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter9: Photosynthesis: Capturing Light Energy

Section9.5: The Carbon Fixation Reactions

Problem 2C: A decrease in entropy occurs during the CO2 uptake phase of the Calvin cycle, as freely moving CO2...

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Concept explainers

Photosynthesis

Plants have a capacity that we humans can only imagine— the ability to produce food from sunlight. Sure, we can prepare some dishes that we can savor on, but it become possible because of the plants (as they serve as a producers of all the raw materials required). Photosynthesis is the method of assembling carbohydrates with the aid of sunlight.

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WHAT IF? Explain why a poison that inhibits an
enzyme of the Calvin cycle will also inhibit the light
reactions

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WHAT IF? The Calvin cycle requires ATP and NADPH,products of the light reactions. If a classmate assertedthat the light reactions don’t depend on the Calvin cycleand, with continual light, could just keep on producingATP and NADPH, how would you respond?
1. Is carbon dioxide essential for photosynthesis? Justify 2. What is the relationship between photosynthesis efficiency and light intensity? Justify 3. For equal quantities of photons, what is the increasing order of effectiveness (less effective to more effective) of blue, red, green and white light (combination of the three main wavelengths) on photosynthetic activity? Justify
Please help! Photosynthesis and Cell respiration: A. What should happen to the O2 levels in a closed container containing a plant during the day? why? B. And what happens to the O2 levels during the night (no light)? Why?
Keep answers, short, simple, and concise. No detail required. Is ATP produced during the light reactions or Calvin cycle? How is it made (what process/enzyme)? Only describe the very last step in ATP production. Is ATP consumed during the light reactions or Calvin cycle? What is it’s energy used to do? Is NADPH produced during the light reactions or Calvin cycle? How is it made (what process/enzyme)? Only describe the very last step in NADPH production.
Answers can be kept very simple and concise Photosynthesis: A) Is NADPH consumed during the light reactions or Calvin cycle? What is it’s energy used to do? Protons move across the thylakoid membrane in both directions during the light reactions of photosynthesis. B) When protons move in to the thylakoid, are they moving up or down their concentration gradient? (From low to high concentration or from high to low concentration?) C) Since protons are charged, they cannot freely diffuse across a plasma membrane. What protein(s) facilitate the transport of protons in to the thylakoid?
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If four molecules of carbon dioxide enter the Calvin cycle (four “turns” of the cycle), how many G3P molecules are produced and how many are exported? 4 G3P made, 1 G3P exported 4 G3P made, 2 G3P exported 8 G3P made, 1 G3P exported 8 G3P made, 4 G3P exported
From which component of the light-dependent reactions does NADPH form most directly? photosystem II photosystem I cytochrome complex ATP synthase
Q21. Photosynthesis is an oxidation-reduction process. Which of the following statements about this redox process is correct? The oxidation of NADPH by the Calvin Cycle is linked to the reduction of CO2. In the electron transport chain, plastocyanin is easier to be oxidized than PQ. Following light absorption H2O is oxidized to O2. Absorption of light by P700 makes it easier to be reduced. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correct
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True or False? In photosynthesis, both photosystems (I and II) depend on the energy of sunlight to excite a chlorophyll molecule until it releases an electron.
In an experiment conducted on photosynthesis-CO2 update and photosynthesis-Determining rate in white light. what gas will be produce as an product of photosynthesis and if present, what will this allow the leaf dice to do? Also, what will be the goal of photosynthesis, and how will it be different from the goal of cellular respiration?