Chlamydomonas cells exposed to high light grow faster than cells grown under lower light. Why is that? A. Under high light, increased levels of G3P in the stromal of the chloroplast increase starch synthesis. B. Under high light, increased photosystem II activity leads to increased O2 levels which support higher rates of respiration. C. Under high light, high levels of cytosolic G3P support higher rates of cellular respiration and biosynthesis. D. Under high light, extra ATP can be exported from the mitochondria to support higher rates of glycolysis.

Chlamydomonas cells exposed to high light grow faster than cells grown under lower light. Why is that? A. Under high light, increased levels of G3P in the stromal of the chloroplast increase starch synthesis. B. Under high light, increased photosystem II activity leads to increased O2 levels which support higher rates of respiration. C. Under high light, high levels of cytosolic G3P support higher rates of cellular respiration and biosynthesis. D. Under high light, extra ATP can be exported from the mitochondria to support higher rates of glycolysis.

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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Chlamydomonas cells exposed to high light grow faster than cells grown under lower light. Why is that? A. Under high light, high levels of cytosolic G3P support higher levels of cellular respiration and biosynthesis. B. Under high light, increased photosystem II activity leads to increased O2 levels which support higher rates of respiration. C. Under high light, increased levels of acetate import increase ATP formation. D. Under high light, extra ATP can be exported from the mitochondria to support higher rates of glycolysis.
W hen a culture of Chlamydomonas is exposed to HIGH intensity light, the cells will display negative phototaxis and move away from the light. Which of the following could act as a cellular signal triggering movement away from the light? A. Low levels of P700+ relative to P700 in the chloroplast. B. High levels of G3P in the cytosol. C. High levels of NAD+ relative to NADH in mitochondria. D. Low levels of ATP relative to ADP in the cytosol.
Compare photophosphorylation and oxidative phosphorylation. How is chemiosmosis in chloroplasts different from chemiosmosis in mitochondria? a. Chemiosmosis is used in chloroplasts to transfer chemical energy from organic molecules to ATP. b. In mitochondria, light is transformed into ATP using photosystems I and II. c. Chemiosmosis in mitochondria occurs across an intra-organelle membrane, where it does not in chloroplasts. d. In chloroplasts, the high-energy electrons come from water.
A. The C4 plant performs photosynthesis more efficiently than the C3 when the CO2 concentration is 600ppm or less. Provide one reason why the rate of photosynthesis doesn’t change for the C4 plant when the CO2 concentration increases above 400 ppm. B. Discuss what is happening in the C3 plant when the CO2 levels are below 50 ppm. Provide one reason why this does NOT happen to the C4 plant.
If you could replace all of the plant ATP synthase with ATP synthase enzymes from animal cells, oriented such that the Fo complex was in the thylakoid membrane with the open channel facing the thylakoid space, and the F1 complex was present in the stroma, how would this affect the ability of photosystem II to generate ATP? Assume that the animal cell ATP synthase functions normally in the chloroplast after replacement.
You have discovered a novel peptide that, when administered to plant cells, spontaneously inserts into the thylakoid membranes and forms a channel that lets protons cross the membrane. You treat plant cells growing normally with your peptide. Which of the following statements correctly describes the effect on photosynthesis shortly after the addition of the peptide? Select all that are true. a. The rate of Glyceraldehyde 3-phosphate synthesis will decrease b. The rate of oxygen production will be unaffected c. The rate of Glyceraldehyde 3-phosphate synthesis will increase d. The rate of oxygen production will decrease e. The rate of oxygen production will increase f. The rate of Glyceraldehyde 3-phosphate synthesis will be unaffected
d) In the presence of sunlight, an electrochemical gradient is generated between two of the spaces within the chloroplast. 1.Describe what happens when a photon of light energy hits a molecule of chlorophyl. 2. What is meant by the term electrochemical gradient? 3.What role does the photosynthetic electron transport chain play in the generation of the electrochemical gradient? 4. Two chemical reactions also contribute to the generation of the electrochemical gradient. What are the reactions, where do they occur, and why do these factors affect the gradient? 5. The electrochemical gradient can be utilised by ATP synthase to generate ATP - explain how the location and structure of ATP synthase enable it to perform this function. e) The light reactions of photosynthesis generate ATP and NADPH for use in the dark reactions (i.e., the Calvin cycle). Why are they needed?
You performed an experiment on photosynthesis on Elodea, using bromothymol blue as an indicator forpH. Your two light conditions were red light and blue light. You found that in blue light, your solutionturned a nice cobalt blue, and in red light it turned green.a. What can you conclude about the efficiency of photosynthesis in Elodea regarding those twowavelengths?b. What would your conclusion be if your negative control (no Elodea in white light) turned greenalso?
A culture of the single celled organism Chlamydomonas is actively carrying out photosynthesis in the presence of light and CO2. If you turned off the light, how would you expect the amounts of ribulose 1,5-bisphosphate and 3-phosphoglycerate to change over the next minute? How about if you left the light on and removed the CO2?
How does the electron transfer pathway from photosynthesis II to photosynthesis I in the light-dependent reactions take place? A. After splitting water in PS-I, high-energy electrons are delivered through the chloroplast electron transport chain to PS-II. B. After the photosynthesis reaction, released products like glucose help in the transfer of electrons from PS-II to PS-I. C. After splitting water in PS-II, high-energy electrons are delivered through the chloroplast electron transport chain to PS-I. D. After the completion of the light-dependent reactions, the electrons are transferred from PS-II to PS-I.
Why is a hypotonic buffer used for the resuspension? 1.DCPIP passes easily across the intact chloroplast membrane, but can't get into the thylakoid, so electron transport could not be reliably measured if using a hypotonic buffer. 2.To gently lyse the chloroplasts, leaving the electron transport membranes intact, whilst allowing DCPIP access 3.To gently separate the chloroplasts from each other, leaving the electron transport membranes intact, whilst allowing DCPIP access 4.DCPIP cannot easily across the intact chloroplast membrane, so electron transport could not be reliably measured if using a hypotonic buffer.
1. Thinking about photosynthetic pigments, which statement is correct? A. The pigments found within most types of photosynthesizing cells are primarily chlorophylls and carotenoids. B. The pigments that reflect solar energy are in the membrane of the thylakoid C. Pigments play an important role in the absorption of chemical energy for photosynthesis. D. Leaves contain only one type of pigment and that is the green chlorophyll.