Biology Chapter 10

Last update by mayur on 03/27/2014
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Produces NADPH

A) light reactions alone

B) the Calvin cycle alone

C) both the light reactions and the Calvin cycle

D) neither the light reactions nor the Calvin cycle

E) occurs in the chloroplast but is not part of photosynthesis



Answer:

A) light reactions alone



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  • feldman2009
    Answered in Biology Chapter 10

    Produces three-carbon sugars

    A) light reactions alone

    B) the Calvin cycle alone

    C) boththe light reactions and the Calvin cycle

    D) neither the light reactions nor the Calvin cycle

    E) occurs in the chloroplast but is not part of photosynthesis



    B) the Calvin cycle alone



  • feldman2009
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    Requires CO2

    A) light reactions alone

    B) the Calvin cycle alone

    C) both the light reactions and the Calvin cycle

    D) neither the light reactions nor the Calvin cycle

    E) occurs in the chloroplast but is not part of photosynthesis



    B) the Calvin cycle alone



  • feldman2009
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    Requires glucose

    A) light reactions alone

    B) the Calvin cycle alone

    C) both the light reactions and the Calvin cycle

    D) neither the light reactions nor the Calvin cycle

    E) occurs in the chloroplast but is not part of photosynthesis

    B) The Calvin Cycle


    Are we sure about this? I thought 3 turns of the Calvin Cycle required 6NADPH, 9 ATP, and 3 CO2, and puts out 9 ADP, 6 NADP+ and 1 glyceraldehyde 3 phosphate... I'm not seeing where glucose is required for it at all...
  • feldman2009
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    The sugar that results from three "turns" of the Calvin cycle is glyceraldehyde-3-phosphate

    (G3P). Which of the following is a consequence of this?

    A) Formation of a moleculeof glucose would require 9 "turns."

    B) G3P more readily forms sucrose and other disaccharides than it does monosaccharides.

    C) Some plants would not taste sweet to us.

    D) The formation of starch in plants involves assembling many G3P molecules, with or withoutfurther rearrangements.

    E) G3P is easier for a plant to store.



    D) The formation of starch in plants involves assembling many G3P molecules, with or withoutfurther rearrangements.



  • feldman2009
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    In the process of carbon fixation, RuBP attaches a CO2to produce a 6 carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to happen in the Calvin cycle?

    A) addition of a pair of electrons from NADPH

    B) inactivation of RuBP carboxylase enzyme

    C) regeneration of ATP from ADP

    D) regeneration of rubisco

    E) a gain of NADPH



    D) regeneration of rubisco



  • feldman2009
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    In metabolic processes of cell respiration and photosynthesis, prosthetic groups such as heme and iron-sulfur complexes are encountered. What do they do?

    A) donate electrons

    B) act as reducing agents

    C) act as oxidizing agents

    D) transport protons within the mitochondria and chloroplasts

    E) both oxidize and reduce during electron transport



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  • feldman2009
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    In an experiment studying photosynthesis performed during the day, you provide a plant with radioactive carbon (14C) dioxide as a metabolic tracer. The14C is incorporated first into oxaloacetate. The plant is best characterized as a

    A) C4plant.

    B) C3plant.

    C) CAM plant.

    D) heterotroph.

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  • feldman2009
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    Why are C4plants able to photosynthesize with no apparent photorespiration?

    A) They do not participate in the Calvin cycle.

    B) They use PEP carboxylase to initially fix CO2.

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    D) They conserve water more efficiently.

    E) They exclude oxygen from their tissues.

    B) They use PEP carboxylase to initially fix CO2.



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    Answered in Biology Chapter 10

    CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

    A) fix CO2into organic acids during the night.

    B) fix CO2into sugars in the bundle-sheath cells.

    C) fix CO2into pyruvatein the mesophyll cells.

    D) use the enzyme phosphofructokinase, which outcompetes rubisco for CO2.

    E) use photosystems I and II at night.



    A) fix CO2into organic acids during the night.



  • feldman2009
    Answered in Biology Chapter 10

    Photorespiration lowers the efficiency of photosynthesis by preventing the formation of

    A) carbon dioxide molecules.

    B) 3-phosphoglycerate molecules

    C) ATP molecules.

    D) ribulose bisphosphate molecules.

    E) RuBP carboxylase molecules.



    B) 3-phosphoglycerate molecules



  • feldman2009
    Answered in Biology Chapter 10

    The alternative pathways of photosynthesis using the C4 or CAM systems are said to be compromises. Why?

    A) Each one minimizes both water loss and rate of photosynthesis.

    B) C4 compromises on water loss and CAM compromises on photorespiration.

    C) Each one both minimizes photorespiration and optimizes the Calvin cycle.

    D) CAM plants allow more water loss, while C4 plants allow less CO2into the plant.

    E) C4 plants allow less water loss but Cam plants but allow more water loss.



    C) Each one both minimizes photorespiration and optimizes the Calvin cycle.