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40 questions
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  • Q1

    A scientist hydrolyzes ATP in a laboratory test tube. He finds that about 3 times as much as heat is released than when the same amount of ATP is hydrolyzed in a cell. Which of the following best explains the scientist’s observation?

    ATP hydrolysis in a cell makes different products that in a test tube.

    Cells are less efficient at producing heat.

    Enzymes in cells use heat energy to catalyze reactions.

    Cells often convert some of the energy from ATP hydrolysis into other usable forms.

    300s
    STEM_BIO11/12-IIa-j-1
  • Q2

    How is ATP hydrolysis used to power other cellular reactions?

    It acts as an enzymatic catalyst.

    It is coupled with an endergonic reaction.

    It adds a phosphate to ADP.

    It produces water which is used to power other reactions.

    300s
    STEM_BIO11/12-IIa-j-1
  • Q3

    In the reaction catalyzed by hexokinase, the two half reactions and their ΔG value are as follows:                                                                            ATP + H2O --> ADP + Pi                                                   ΔG = -31kJ/mol

    Pi + glucose --> glucose-6-P + H2O                           ΔG = +14kJ/mol      The ΔG for the conversion of glucose to glucose-6-P with ATP as the phosphoryl donor is __________.

    -45kJ/mol

    -17kJ/mol

    +17kJ/mol

    +45kJ/mol

    300s
    STEM_BIO11/12-IIa-j-1
  • Q4

    An endergonic reaction can proceed only if it absorbs __________.

    the same amount of free energy that is absorbed by the enzymatic breakdown

    less free energy than is released by a coupled endergonic reaction

    less free energy than is released by a coupled exergonic reaction

    more free energy than is released by a coupled exergonic reaction

    300s
    STEM_BIO11/12-IIa-j-1
  • Q5

    What would you expect to happen if you compare the rate of photosynthesis in bright white light and in darkness?

    The rate of photosynthesis will not be affected by bright white light or darkness.

    The rate of photosynthesis will be greater in bright white light than in darkness.

    The rate of photosynthesis will start slowly under bright white light, and then increase in darkness.

    The rate of photosynthesis will be less under bright white light than in darkness.

    300s
    STEM_BIO11/12-IIa-j-3
  • Q6

    In paper chromatography, photosynthetic pigments from a plant pigment extract will separate due to their ­­­­­­difference in__________.

    molecular weight of the pigments

    boiling point of the pigments

    pH level of the pigments

    solubility in a transport solution

    300s
    STEM_BIO11/12-IIa-j-3
  • Q7

    The color of a photopigment is due to the __________.

    color of light that it reflects

    color of the leaf

    season of the year

    color of light that it absorbs

    300s
    STEM_BIO11/12-IIa-j-3
  • Q8

    Based on a variety of experiments, it is known that the rate of photosynthesis is highest when wavelengths of light between 400 and 500 nm are used, and when wavelengths around 700 nm are used. What does this indicate about the relative importance of chlorophyll a and b in photosynthesis?

    Reflection of light by chlorophyll a and b is essential for the process of photosynthesis.

    The combined reflection of light by chlorophyll a and absorption of light by chlorophyll b are essential for the process of photosynthesis.

    Transmission of light by chlorophyll a and b is essential for the process of photosynthesis.

    Absorption of light by chlorophyll a and b is essential for the process of photosynthesis.

    300s
    STEM_BIO11/12-IIa-j-3
  • Q9

    Asa result of the cascade of electrons down the electron transport chains of the light reactions, __________.

    NADP+ is oxidized to NADPH

    NADP+ is reduced to NADPH

    NADPH is oxidized to NADP+

    NADPH is reduced to NADP+

    300s
    STEM_BIO11/12-IIa-j-4
  • Q10

    The electrons lost from the reaction center of photosystem I are replaced by electrons from __________.

    ATP molecules

    the top of the electron transport chain

    the bottom of the electron transport chain

    H2O molecules

    300s
    STEM_BIO11/12-IIa-j-4
  • Q11

    The electrons lost from the reaction center of photosystem II are replaced by electrons from ­­­­__________.

    the top of the electron transport chain

    the bottom of the electron transport chain

    ATP molecules

    H2O molecules

    300s
    STEM_BIO11/12-IIa-j-4
  • Q12

    Photophosphorylation differs from oxidative phosphorylation in that __________.

    energy is stored in the form of a proton concentration difference

    the final electron acceptor is NADP+ and not oxygen

    regeneration of ATP is driven by a flow of protons through an ATP synthase

    it involves an electron transport chain

    300s
    STEM_BIO11/12-IIa-j-4
  • Q13

    Which of the following are produced during the Calvin cycle?

    glucose, ADP, NADP+

    ATP, NADPH, CO2

    ATP, NADPH, O2

    glucose, ADP, NADP+, CO2

    300s
    STEM_BIO11/12-IIa-j-5
  • Q14

    Carbon, in the form of CO2, must be taken from the atmosphere and attached to an existing organic molecule in the Calvin cycle. Therefore, the carbon is bound to the molecule. The products of the cycle only occur because of the added carbon. What are the products of the Calvin cycle and what is regenerated?

    The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBisCO is regenerated.

    The product of the Calvin cycle is a 3-PGA molecule and glyceraldehyde-3 phosphate is regenerated.

    The product of the Calvin cycle is glyceraldehyde-3 phosphate and RuBP is regenerated.

    The product of the Calvin cycle is glyceraldehyde-3 phosphate and oxygen is regenerated.

    300s
    STEM_BIO11/12-IIa-j-5
  • Q15

    What does RuBisC0 do?

    Adds CO2 to RuBP in the carbon fixation stage

    Regenerates RuBP with the aid of ATP

    Combines electrons and H+ to reduce NADP+ to NADPH

    Transfers electrons from NADPH to 1,3-biphosphoglycerate to produce G3P

    300s
    STEM_BIO11/12-IIa-j-5

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