chapter 8 dynamic study module

during photosynthesis, an electron transport chain transports a. electron from photosystem II to photosystem I b. excited electrons from P700 to an electron acceptor c. excited electrons from P680 to an electron acceptor d. excited electrons from P700 to an electron acceptor and transport excited electron from P680 to an electron acceptor e. NADPH from the light reactions to the Calvin cycle

a

the most important role of pigments in photosynthesis is to a. capture light energy b. catalyze the hydrolysis of water c. absorb heat energy d. catalyze the synthesize of ATP e. store energy

a

the reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. why? a. the Calvin cycle requires products only produces when the photosystems are illuminated b. plants usually open their stomata at night c. carbon dioxide concentrations decrease at night d. it is often too cold at night for these reactions to take place e. at night, no water is available for the Calvin cycle

a

which of the following does not occur during the Calvin cycle? a. release of oxygen b. regeneration of the CO2 acceptor c. oxidation of NADPH d. consumption of ATP e. carbon fixation

a

you could distinguish a granum from a crista because the granum, but not the crista, would a. have photosynthetic pigments b. be inside a mitochondrion c. function in energy transformation d. all of the listed responses are correct e. contain protein but not lipids

a

a photon of which of these colors of light would carry the most energy? a. red b. blue c. yellow d. green e. orange

b

rubisco is a. the 5-carbon sugar molecule that reacts with CO2 to begin the Calvin cycle b. the enzyme in C3 plants that first captures CO2 to begin the Calvin cycle c. the first stable intermediate in C4 photosynthesis d. the enzyme responsible for splitting H2O to produce O2 in photosynthesis e. the enzyme that forms a 4-carbon compound in CAM photosynthesis

b

what portion of the electromagnetic spectrum is most absorbed by the chlorophyll pigments in the thylakoid membranes? a. the entire spectrum of white light b. blue-violet and red light c. the infrared d. green, which is why plants are green e. the same range absorbed by carotenoids

b

which of the following statements correctly describes the relationship between the light reactions and the Calvin cycle? a. the light reactions produce carbon dioxide, ATP, and NADPH, all of which are used in the Calvin cycle b. the light reactions produce ATP and NADPH, both of which are used in the Calvin cycle c. the light reactions produce carbon dioxide and water, both of which are used in the Calvin cycle d. the light reactions produce ADP and NADP+, both of which are used in the Calvin cycle e. the light reactions produce water, ATP, and NADPH, all of which are used in the Calvin cycle

b

why are C4 plants more suited to hot climates than C3 plants? a. they do not close their stomata in hot, dry weather b. unlike C3 plants, they keep fixing carbon dioxide even when the concentration of carbon dioxide in the leaf is low c. they are an older lineage and have had longer to adapt d. the same cells that bind carbon dioxide perform the Calvin cycle e. they suspend photosynthesis during the hottest part of the day

b

glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. which of the following statements about this compound is most true? a. for every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP b. it is a three-carbon sugar c. all of the listed responses are correct d. for every three molecules of CO2, six molecules of G3P are formed but only one molecule exits the cycle to be used by the plant cell e. it is produced from glucose during glycolysis

c

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

c

the Calvin cycle occurs in the a. matrix b. stomata c. stroma d. thylakoid space e. thylakoid membrane

c

when chloroplast pigments absorb light, a. their photons become excited b. they become reduced c. their electrons become excited d. the Calvin cycle is completed e. they lose potential energy

c

which process is most directly driven by light energy? a. carbon fixation in the stroma b. ATP synthesis c. removal of electrons from chlorophyll molecules d. reduction of NADP+ molecules e. creation of a pH gradient by pumping protons across the thylakoid membrane

c

chlorophyll molecules are in which part of the chloroplast? a. stomata b. thylakoid space c. plasma membrane d. thylakoid membranes e. stroma

d

during photosynthesis in a eukaryotic cell, an electrochemical gradient is formed across the a. chloroplast inner membrane b. cristae c. chloroplast outer membrane d. thylakoid membrane e. stomata

d

how is photosynthesis similar in C4 plants and CAM plants? a. both types of plants make sugar without the Calvin cycle b. in both cases, thylakoids are not involved in photosynthesis c. in both cases, only photosystem I is used d. rubisco is not the enzyme that catalyzes the initial fixation of carbon e. both types of plants make most of their sugar in the dark

d

in photosynthesis, plants use carbon from _____ to make sugar and other organic molecules. a. soil b. chlorophyll c. water d. carbon dioxide e. the sun

d

the source of the oxygen produced by photosynthesis has been identified through experiments using radioactive tracers. the oxygen comes from a. light b. glucose c. carbon dioxide d. water e. radioisotopes

d

how does carbon dioxide enter the leaf? a. through the chloroplasts b. through the vascular system c. through the thylakoids d. through the roots e. through the stomata

e

what is the role of NADP+ in photosynthesis? a. as part of the process of chemiosmosis, it manufactures ATP b. it is the pigment that captures light energy c. it donates electrons to the electron transport chain linking photosystems II and I d. it replaces the electrons donated by P680 e. it is reduced and then carries electrons to the Calvin cycle

e

where do the electrons entering photosystem photosystem II come from? a. chlorophyll molecules in the antenna complex b. the electron transport chain c. light d. ATP e. water

e

which of the following sequences correctly represents the flow of electrons during photosynthesis? a. NADPH --> electron transport chain --> O2 b. NADPH --> chlorophyll --> Calvin cycle c. H2O --> photosystem I --> photosystem II d. NADPH --> O2 --> CO2 e. H2O --> NADPH --> Calvin cycle

e

which of the following statements is a correct distinction between autotrophs and heterotrophs? a. only heterotrophs require oxygen b. cellular respiration is unique to heterotrophs c. only heterotrophs have mitochondria d. only heterotrophs require chemical compounds from the environment e. autotrophs, but not heterotrophs, can nourish themselves beginning with CO2 and other nutrients that are inorganic

e