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a. light energy
b. CO2 and ATP
c. H2O and NADPH
d. ATP and NADPH
e. sugar and O2
a. NADPH –> O2 –> CO2
b. H2O –> NADPH –> Calvin cycle
c. NADPH –> chlorophyll –> Calvin cycle
d. H2O –> photosystem I –> photosystem II
e. NADPH –> electron transport chain –> O2
a. In both cases, only photosystem I is used.
b. Both types of plants make sugar without the Calvin cycle.
c. In both cases, rubisco is not fixed to carbon initially.
d. Both types of plants make most of their sugar in the dark.
e. In both cases, thylakoids are not involved in photosynthesis.
a. Only heterotrophs require chemical compounds from the environment.
b. Cellular respiration is unique to heterotrophs.
c. Only heterotrophs have mitochondria.
d. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic.
e. Only heterotrophs require oxygen.
a. carbon fixation
b. oxidation of NADPH
c. release of oxygen
d.regeneration of the CO2 acceptor
e. comsumption of ATP
a. substrate-level phosphorylation
b. oxidative phosphorylation in cellular respiration
c. the Calvin cycle
d. carbon fixation
e. reduction of NADP+
a. creation of a pH gradient by pumping protons across the thylakoid membrane
b. carbon fixation in the stroma
c. reduction of NADP+ molecules
d. removal of electrons from chlorophyll molecules
e. ATP synthesis
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| Question | Answer |
|
The light reactions of photosynthesis supply the Calvin cycle with CO2 and ATP. |
ATP and NADPH |
|
Which of the following sequences correctly represents the flow of electrons during photosynthesis? NADPH → electron transport chain → O2 |
H2O – NADPH- Calvin cycle |
|
How is photosynthesis similar in C4 plants and CAM plants? Both types of plants make most of their sugar in the dark. |
in both cases, rubisco is not used to fix carbon initially |
|
Which of the following statements is a correct distinction between autotrophs and heterotrophs? Only heterotrophs require oxygen. |
autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic |
|
Which of the following does not occur during the Calvin cycle? consumption of ATP |
release of oxygen |
|
In mechanism, photophosphorylation is most similar to the Calvin cycle. |
oxidative phosphorylation in cellular respiration |
|
Which process is most directly driven by light energy? ATP synthesis |
removal of electrons from chlorophyll molecules |
|
In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules. (eText Overview) water |
carbon dioxide |
|
Which of the following groups of organisms contains only heterotrophs? (eText Overview) bacteria |
fungi |
|
How does carbon dioxide enter the leaf? (eText Concept 10.1) through the chloroplasts |
through the stomata |
|
In a rosebush, chlorophyll is located in __________. (eText Concept 10.1) chloroplasts, which are in mesophyll cells in the thylakoids of a leaf |
thylakoids, which are in the chloroplasts in the mesophyll cells of a leaf |
|
Chlorophyll molecules are in which part of the chloroplast? (eText Concept 10.1) thylakoid membranes |
thylakoid membranes |
|
The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from __________. (eText Concept 10.1) carbon dioxide |
water |
|
In photosynthesis, what is the fate of the oxygen atoms present in CO2? They end up __________. (eText Concept 10.1) as molecular oxygen |
in sugar molecules and in water |
|
Open Hint for Question 8 in a new window Molecular oxygen is produced during __________. (eText Concept 10.1) glycolysis |
linear electron flow during the light reactions |
|
Open Hint for Question 9 in a new window The reactions of the Calvin cycle are NOT directly dependent on light, but they usually do NOT occur at night. Why? (eText Concept 10.1) It is often too cold at night for these reactions to take place. |
the Calvin cycle requires products only produced when the photosystems are illuminated |
|
The Calvin cycle occurs in the __________. (eText Concept 10.1) thylakoid membrane |
stroma |
|
What is the role of NADP+ in photosynthesis? (eText Concept 10.1) It helps produce ATP from the light reactions. |
it forms NADPH to be used in the calvin cycle |
|
A photon of which of these colors would carry the most energy? (eText Concept 10.2) green |
blue |
|
What is the range of wavelengths of light that are absorbed by the pigments in the thylakoid membranes? (eText Concept 10.2) green, which is why plants are green |
capture light energy |
|
The most important role of pigments in photosynthesis is to __________. (eText Concept 10.2) capture light energy |
blue-violet and red-orange |
|
Based on the work of Engelmann, a plot of photosynthetic activity versus wavelength of light is referred to as __________. (eText Concept 10.2) an effective spectrum |
action spectrum |
|
When chloroplast pigments absorb light, __________. (eText Concept 10.2) the pigments become reduced |
the pigments’ electrons become excited |
|
What structure is formed by the reaction center, light-harvesting complexes, and primary electron acceptors that cluster, and is located in the thylakoid membrane? (eText Concept 10.2) the fluorescence center |
the photosystem |
|
Where do the electrons entering photosystem II come from? (eText Concept 10.2) chlorophyll molecules in the antenna complex |
water |
|
During photosynthesis in chloroplasts, O2 is produced from __________ via a series of reactions associated with __________. (eText Concept 10.2) CO2 … photosystem II |
H2O … photosystem II |
|
Which of the following is cycled in the cyclic variation of the light reactions? (eText Concept 10.2) electrons |
electrons |
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