Biology 190 Chapter 10 Answers

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The light reactions of photosynthesis supply the Calvin cycle with
a. light energy
b. CO2 and ATP
c. H2O and NADPH
d. ATP and NADPH
e. sugar and O2

d. ATP and NADPH

Which of the following sequences correctly represents the flow of electrons during photosynthesis?
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

b. H2O –> NADPH –> Calvin cycle

How is photosynthesis similar in C4 plants and CAM plants?
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.

c. In both cases, rubisco is not fixed to carbon initially.

Which of the following statements is a correct distinction between autotrophs and heterotrophs?
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.

d. 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?
a. carbon fixation
b. oxidation of NADPH
c. release of oxygen
d.regeneration of the CO2 acceptor
e. comsumption of ATP

c. release of oxygen.

In mechanism, photophosphorylation is most similar to
a. substrate-level phosphorylation
b. oxidative phosphorylation in cellular respiration
c. the Calvin cycle
d. carbon fixation
e. reduction of NADP+

b. oxidatvie phosphorylation in cellular respiraton.

Which process is most directly driven by light energy?
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

d. removal of electrons from chlorophyll molecules.

–

Question	Answer
The light reactions of photosynthesis supply the Calvin cycle with CO2 and ATP. H2O and NADPH. sugar and O2. ATP and NADPH. light energy.	ATP and NADPH
Which of the following sequences correctly represents the flow of electrons during photosynthesis? NADPH → electron transport chain → O2 NADPH → O2 → CO2 H2O → NADPH → Calvin cycle NADPH → chlorophyll → Calvin cycle H2O → photosystem I → photosystem II	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, only photosystem I is used. In both cases, thylakoids are not involved in photosynthesis. Both types of plants make sugar without the Calvin cycle. In both cases, rubisco is not used to fix carbon initially.	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. Cellular respiration is unique to heterotrophs. Autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic. Only heterotrophs require chemical compounds from the environment. Only heterotrophs have mitochondria.	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 carbon fixation oxidation of NADPH regeneration of the CO2 acceptor release of oxygen	release of oxygen
In mechanism, photophosphorylation is most similar to the Calvin cycle. substrate-level phosphorylation in glycolysis. carbon fixation. reduction of NADP+. oxidative phosphorylation in cellular respiration.	oxidative phosphorylation in cellular respiration
Which process is most directly driven by light energy? ATP synthesis carbon fixation in the stroma reduction of NADP+ molecules removal of electrons from chlorophyll molecules creation of a pH gradient by pumping protons across the thylakoid membrane	removal of electrons from chlorophyll molecules
In photosynthesis, plants use carbon from __________ to make sugar and other organic molecules. (eText Overview) water carbon dioxide chlorophyll the sun soil	carbon dioxide
Which of the following groups of organisms contains only heterotrophs? (eText Overview) bacteria protists fungi All of the listed responses are correct. None of the listed responses are correct.	fungi
How does carbon dioxide enter the leaf? (eText Concept 10.1) through the chloroplasts through the roots through the thylakoids through the stomata through the vascular system	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 mesophyll cells, found within the thylakoids of a leaf’s chloroplasts thylakoids, which are in mesophyll cells in the chloroplasts of a leaf chloroplasts, which are in thylakoids in the mesophyll cells of a leaf thylakoids, which are in chloroplasts in the mesophyll cells 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 stroma stomata plasma membrane thylakoid lumen	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 glucose radioisotopes water light	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 in water as molecular oxygen and in sugar molecules in sugar molecules and in water	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 the Calvin cycle cyclic electron flow during the light reactions re-energization of electrons by PSI	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. Carbon dioxide concentrations decrease at night. The Calvin cycle requires products only produced when the photosystems are illuminated. Plants usually open their stomata at night. At night, no water is available for the Calvin cycle.	the Calvin cycle requires products only produced when the photosystems are illuminated
The Calvin cycle occurs in the __________. (eText Concept 10.1) thylakoid membrane thylakoid lumen stroma stomata matrix	stroma
What is the role of NADP+ in photosynthesis? (eText Concept 10.1) It helps produce ATP from the light reactions. It absorbs light energy. It forms part of photosystem II. It is the primary electron acceptor. It forms NADPH to be used in the Calvin cycle.	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 yellow blue orange red	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 blue-violet and red-orange the entire spectrum of white light the infrared the range absorbed by carotenoids	capture light energy
The most important role of pigments in photosynthesis is to __________. (eText Concept 10.2) capture light energy screen out harmful ultraviolet rays store energy catalyze the hydrolysis of water catalyze the synthesis of ATP	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 an absorption spectrum an electromagnetic spectrum a visible light spectrum an action spectrum	action spectrum
When chloroplast pigments absorb light, __________. (eText Concept 10.2) the pigments become reduced the pigments lose potential energy the pigments’ electrons become excited the Calvin cycle is triggered the pignments’ photons become excited	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 the electron transport chain NADP+ reductase ATP synthase	the photosystem
Where do the electrons entering photosystem II come from? (eText Concept 10.2) chlorophyll molecules in the antenna complex ATP the electron transport chain light water	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 CO2 … the Calvin cycle H2O … photosystem I CO2 … both photosystem I and the Calvin cycle	H2O … photosystem II
Which of the following is cycled in the cyclic variation of the light reactions? (eText Concept 10.2) electrons ATP NADPH ribulose bisphosphate protons	electrons

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Biology 190 Chapter 10 Answers

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