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.

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.

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, 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.
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.
Chlorella is a photosynthetic alga that is related to Chlamydomonas. However, unlike Chlamydomonas, Chlorella is exclusively autotrophic. In what ways are these two species biochemically different? A. Chlorella can generate more G3P in the light than Chlamydomonas can B. Only Chlamydomonas can respire in the dark as well as the light. C. Only Chlamydomonas can gain carbon in the dark. D. Only Chlamydomonas can metabolize glucose.
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.
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
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?
Chemiosmosisa. depends on complexes in the thylakoid membrane.b. depends on an electrochemical gradient.c. depends on a difference in H+ concentration between thethylakoid space and the stroma.d. results in ATP formation.e. All of these are correct.
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.
1. During the light dependent reaction, the molecules within the membrane absorb light energy 2. high energy compounds light dependent portion of photosynthesis 3. an electron which is released by a process called and are produced in the in the thylakoid enters where it is energized and used to convert energy. 4. protons travel through located in the thylakoid membrane in a high energy compound. a process known as 5. The three stages of the light independent reaction are to produce and 6. The most abundant protein on earth is 7. You would need molecules of RuBp in order to create 1 molecule of glucose
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.
The use of the C4 pathway for initial carbon fixation (CO2 into a 4C compound) I. occurs only in plants with specialized leaf anatomy containing bundle sheath cells surrounded by a ring of mesophyll cells II. occurs during the day in CAM plants III. reduces the problems of photorespiration by isolating the enzyme PEP carboxylase from high levels of dissolved O2 Select one: a. Only III is true b. Only I and III are true c. Only I is true d. Only I and II are true e. I, II and III are true
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.