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Chapter Chapter 7: Photosynthesis: Using Light to Make Food
 
Chapter Quiz
 

1 .       Which of these types of organisms produce the biosphere's food supply? (7.1) [Hint]

 producers
 consumers
 heterotrophs
 consumers and heterotrophs
 producers and heterotrophs
2 .       In a rosebush, chlorophyll is located in _____. (7.2) [Hint]

 chloroplasts, which are in mesophyll cells in the thylakoids of a leaf
 mesophyll cells, which are in the thylakoids in chloroplasts in a leaf
 thylakoids, which are in mesophyll cells in the chloroplasts in 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
3 .       How does carbon dioxide enter the leaf? (7.2) [Hint]

 through the chloroplasts
 through the mesophyll
 through the thylakoids
 through the stomata
 through the vascular system
4 .       Chlorophyll molecules are in which part of the chloroplast? (7.2) [Hint]

 grana
 stroma
 stomata
 plasma membrane
 Golgi apparatus
5 .       You could distinguish a granum from an inner mitochondrial membrane because the granum, but not the inner mitochondrial membrane, would _____. (7.2) [Hint]

 be inside a mitochondrion
 function in energy transformation
 have photosynthetic pigments
 contain protein but not lipids
 grana and inner mitochondrial membranes are indistinguishable
6 .       The source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. The oxygen comes from _____. (7.3) [Hint]

 carbon dioxide
 glucose
 radioisotopes
 water
 light
7 .       In photosynthesis, what is the fate of the oxygen atoms present in CO2? They end up __________. (7.3) [Hint]

 as molecular oxygen
 in sugar molecules
 in water
 as molecular oxygen and in sugar molecules
 in sugar molecules and in water
8 .       In an experiment, a plant was given ____ containing radioactive 18O, and the radioactive oxygen atoms were used to make sugar. (7.3) [Hint]

 water
 chlorophyll
 oxygen gas
 ATP
 carbon dioxide
9 .       In photosynthesis, plants use carbon from ____ to make sugar and other organic molecules. (7.3) [Hint]

 water
 carbon dioxide
 chlorophyll
 the sun
 soil
10 .       Cellular respiration and photosynthesis are similar in that both involve _____. (7.4) [Hint]

 the production of sugars
 redox reactions
 the release O2 into the atmosphere
 the release of CO2 into the atmosphere
 water splitting
11 .       The photosynthetic event known as the Calvin cycle occurs in the _____. (7.5) [Hint]

 thylakoid membrane
 thylakoid compartment
 stroma
 stomata
 matrix
12 .       The "photo-" part of the word "photosynthesis" refers to _________, whereas "-synthesis" refers to __________. (7.5) [Hint]

 the light reactions that occur in the thylakoids ... carbon fixation
 the reactions in the stomata ... the reactions in the thylakoid
 the Calvin cycle ... carbon fixation
 the Calvin cycle ... the reactions in the stroma
 the light reactions ... reactions in the thylakoids
13 .       The wavelengths of light absorbed by pigments in the granum are mainly in which range? (7.6) [Hint]

 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
14 .       The most important role of pigments in photosynthesis is to _____. (7.6) [Hint]

 capture light energy
 screen out harmful ultraviolet rays
 store energy in glucose molecules
 release energy from glucose molecules
 store energy in ATP
15 .       Which one of the following colors is most strongly transmitted by chlorophyll? (7.6) [Hint]

 red
 orange
 yellow
 green
 blue
16 .       Which of these wavelengths is LEAST useful for photosynthesis? (7.6) [Hint]

 green
 yellow
 blue
 orange
 red
17 .       When chloroplast pigments absorb light, _____. (7.7) [Hint]

 they become reduced
 they lose potential energy
 their electrons become excited
 the Calvin cycle is triggered
 their photons become excited
18 .       The reaction center, antenna molecules, and primary electron acceptors that cluster in the thylakoid membrane form which structure? (7.7) [Hint]

 fluorescence center
 photosystem
 electron transport chain
 carbon-fixation unit
 electromagnetic spectrum
19 .       The synthesis of glucose by photosynthesis is an endergonic process. The source of the energy for the excited electrons is _____. (7.7) [Hint]

 chlorophyll
 carbon dioxide
 water
 glucose
 light
20 .       The light reactions of photosynthesis generate high-energy electrons, which end up in ____. The light reactions also produce ____ and ____. (7.8) [Hint]

 ATP ... NADPH ... oxygen
 oxygen ... sugar ... ATP
 chlorophyll ... ATP ... NADPH
 water ... sugar ... oxygen
 NADPH ... ATP ... oxygen
21 .       Where do the electrons needed by photosystem II originate? (7.8) [Hint]

 other chlorophyll molecules
 ATP
 the electron transport chain
 light
 water
22 .       During photosynthesis in chloroplasts, O2 is produced from __________ via a series of reactions associated with __________. (7.8) [Hint]

 CO2 ... photosystem II
 H2O ... photosystem II
 CO2 ... Calvin cycle
 H2O ... photosystem I
 CO2 ... both photosystem I and the Calvin cycle
23 .       Light reactions do all of the following EXCEPT _____. (7.8) [Hint]

 convert sunlight to chemical energy
 synthesize ATP and NADPH
 reduce CO2
 convey excited electrons from chlorophyll to an electron acceptor
 absorb photons
24 .       During photosynthesis, an electron transport chain is used to _____. (7.8) [Hint]

 transport NADPH from the light reactions to the Calvin cycle
 transport excited electrons from P700 to an electron acceptor
 transport excited electrons from P680 to an electron acceptor
 transport electrons from photosystem II to photosystem I
 transport excited electrons from P700 to an electron acceptor and transport excited electrons from P680 to an electron acceptor
25 .       Molecular oxygen is produced during _____. (7.8) [Hint]

 glycolysis
 light reactions of photosynthesis
 the Calvin cycle
 aerobic respiration
 electron transport chain
26 .       Light reactions are well located in the thylakoid membrane because _____. (7.9) [Hint]

 the membrane brings chlorophyll closer to the light
 the enzymes involved require a lipid bound to their active site
 chemiosmosis can be set up across the thylakoid membrane
 the membrane functions as a mitochondrial membrane at night
 the membrane binds oxygen
27 .       Both mitochondria and chloroplasts _____. (7.9) [Hint]

 use a H+ gradient to produce ATP
 obtain electrons from water
 reduce NAD+, forming NADP
 release oxygen as a by-product
 are surrounded by a single membrane
28 .       In addition to its function during electron transport in mitochondria, the chemiosmotic mechanism is important for generating ATP during the _____. (7.9) [Hint]

 fermentation of glucose
 process of intracellular digestion within lysosomes
 light reactions of photosynthesis
 process of DNA replication
 synaptic transmission
29 .       During photosynthesis in a eukaryotic cell, a high H+ concentration accumulates or is formed in the ___________. (7.9) [Hint]

 thylakoid membrane
 thylokoid compartment
 stroma
 stomata
 matrix
30 .       The energy used to produce ATP in the light reactions of photosynthesis comes from _____. (7.9) [Hint]

 the burning of sugar molecules
 splitting water
 movement of H+ through a membrane
 carbon fixation
 fluorescence
31 .       Which of the following correctly matches each of the inputs of the Calvin cycle with its role in the cycle? (7.10) [Hint]

 carbon dioxide: high-energy electrons ... ATP: energy ... NADPH: carbon
 carbon dioxide: carbon ... ATP: energy ... NADPH: high-energy electrons
 carbon dioxide: high-energy electrons ... ATP: carbon ... NADPH: energy
 carbon dioxide: energy ... ATP: carbon ... NADPH: high-energy electrons
 carbon dioxide: hydrogen ... ATP: carbon ... NADPH: energy
32 .       The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why? (7.10) [Hint]

 It is often too cold at night for these reactions to take place.
 Carbon dioxide concentrations decrease at night.
 The Calvin cycle depends on products of the light reactions.
 Plants usually open their stomata at night.
 At night, plants cannot produce the water needed for the Calvin cycle.
33 .       The Calvin cycle is a series of reactions that _____. (7.10) [Hint]

 assemble sugar molecules by fixing carbon
 convert light energy to chemical energy
 produce oxygen gas
 produce NADPH
 all of the above
34 .       Why is NADP+ needed in photosynthesis? (7.10) [Hint]

 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.
35 .       Rubisco is _____. (7.10) [Hint]

 the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle
 the enzyme responsible for splitting H2O to produce O2 in photosynthesis
 the enzyme that forms a 4-carbon compound in CAM metabolism
 the first stable intermediate in CAM metabolism
 the 5-carbon sugar molecule that reacts with CO2 to begin the Calvin cycle
36 .       What is the role of NADP+ in photosynthesis? (7.10) [Hint]

 It assists chlorophyll in capturing light.
 It acts as the primary electron acceptor for the photosystems.
 As part of the electron transport chain, it manufactures ATP.
 It assists photosystem II in the splitting of water.
 It is reduced and then carries electrons to the Calvin cycle.
37 .       You have a large, healthy philodendron that you carelessly leave in total darkness while you are away on vacation. You are surprised to find that it is still alive when you return. What has the plant been using for an energy source while in the dark? (7.11) [Hint]

 Even though it can't carry out the light reactions, the plant can still produce sugars because the Calvin cycle doesn't require light.
 While it did have access to light before you left, the plant stored energy in the form of sugars or starch, and it was able to derive energy from those during your vacation.
 Even though the plant received no visible light, it was able to use the short-wave part of the electromagnetic spectrum (gamma rays and X-rays) to carry out photosynthesis.
 When light energy is not available, plants can derive energy from inorganic molecules.
 None of these.
38 .       Phenol red is a chemical that turns red when carbon dioxide, CO2, is absent and yellow when CO2 is present. A small green plant seedling is placed in phenol red in the dark. Which one of the following is most likely to occur? (7.11) [Hint]

 If the solution is yellow to begin with, it will turn red because photosynthesis is occurring.
 If the solution is red to begin with, it will turn yellow because photosynthesis is occurring.
 If the solution is yellow to begin with, it will turn red because respiration is occurring.
 If the solution is red to begin with, it will turn yellow because respiration is occurring.
 None of the above.