QUIZ #7 BIOLOGY

which of the following is a CAM plant pineapple corn rice wheat oak tree

a. pineapple

Which of the following organisms are capable of photosynthesis? a. plants only b. plants and algae only c. plants and some bacteria only d. plants, algae, and some bacteria

d. plants, algae, and some bacteria

Characterize these reactions involved in the Calvin cycle. Chart These are reactions involved in the regeneration of RuBP. The reactions include an exergonic reaction (ATP breaks down into ADP) and the reduction of the coenzyme NADPH. These reactions are involved in the reduction of CO2. Energy is required in the form of ATP, which is hydrolyzed to ADP. The substrate BPG is reduced, while the coenzyme NADPH is oxidized. These reactions are involved in the fixation of CO2. Energy is required in the form of ADP, which is hydrolyzed to ATP. The substrate BPG is oxidized, while the coenzyme NADPH is reduced. These reactions are part of the light reactions in a noncyclic pathway. ATP and NADPH are used during these reactions.

b. These reactions are involved in the reduction of CO2. Energy is required in the form of ATP, which is hydrolyzed to ADP. The substrate BPG is reduced, while the coenzyme NADPH is oxidized.

During the light reactions, what structure is responsible for absorbing the solar energy? stoma chloroplast bark of the tree stroma

b. chloroplast

Which of the following statements about the Calvin cycle is correct? The CO2 is absorbed and reduced to C2H2O2. The CO2 is absorbed and reduced to CH2O. The CO2 is absorbed and used to form ATP. The CO- is absorbed and reduced to CH2O.

b. The CO2 is absorbed and reduced to CH2O.

What would happen if a drug directly interfered with the functioning of RuBP carboxylase? a. Water would not be split at the start of photosystem II, halting the light reactions. b. Chemiosmosis and ATP production would cease, halting the Calvin cycle. c. Carbon dioxide would not be fixed to RuBP, stalling the Calvin cycle. d. RuBP would not be regenerated from G3P, halting the Calvin cycle.

c. Carbon dioxide would not be fixed to RuBP, stalling the Calvin cycle.

What is a characteristic of C4 leaves? Bundle sheath cells lack chlorophyll. Stomata are arranged concentrically around bundle sheath cells. Mesophyll cells are arranged concentrically around bundle sheath cells. Mesophyll cells lack chlorophyll.

c. Mesophyll cells are arranged concentrically around bundle sheath cells.

To what does the term grana refer? the double membrane that surrounds the chloroplast a flattened disk or sac in the chloroplast a stack of thylakoid membranes the fluid-filled space of the chloroplast the pores on the underside of a leaf that facilitate gas exchange

c. a stack of thylakoid membranes

Which is most closely associated with the Calvin cycle? ATP production oxygen production carbon dioxide fixation carbon dioxide production removal of electrons from water for passage through an electron transport system

c. carbon dioxide fixation

The function of sunlight in photosynthesis is to reduce NADPH to NADP. fix O2 in the Calvin cycle. excite electrons in chlorophyll. combine carbon dioxide and water to form ATP and NADPH. split water releasing oxygen.

c. excite electrons in chlorophyll.

Why are plants green? a. They absorb only green wavelengths of light. b. They absorb only yellow and blue wavelengths of light, which when mixed within the leaf, give plants their characteristic green color. c. They reflect all of the ultraviolet wavelengths and absorb all of the visible light spectrum. d. They reflect green wavelengths of light and absorb other colors of the visible light spectrum. e. They reflect the colors of the visible light spectrum and absorb all of the wavelengths associated with the ultraviolet spectrum.

d. They reflect green wavelengths of light and absorb other colors of the visible light spectrum.

To what does the term stroma refer? the double membrane surrounding the chloroplast a flattened disk or sac in the chloroplast a stack of thylakoid membrane structures the fluid-filled space of the chloroplast the pores on the underside of the leaf that facilitate gas exchange

d. the fluid-filled space of the chloroplast

Which statement is NOT true about the noncyclic electron pathway? Electrons are boosted to higher energy level in photosystem I. Sunlight excites electrons in photosystem II. It produces ATP. It produces NADPH. It produces carbohydrates through carbon dioxide fixation.

e. It produces carbohydrates through carbon dioxide fixation.

Photorespiration occurs mainly in C3 plants. C4 plants. CAM plants. All of the answer choices.

C3 plants.

Which of the following are characteristics of C4 plants? Select all that apply. (4) C4 plants store carbon dioxide temporarily as oxaloacetate. C4 plants are found in hot, dry climates. C4 plants have a net photosynthetic rate two or three times greater than C3 plants. C4 plants experience more photorespiration than C3 plants. C4 plants separate carbon fixation from the Calvin cycle.

C4 plants store carbon dioxide temporarily as oxaloacetate. C4 plants are found in hot, dry climates. C4 plants have a net photosynthetic rate two or three times greater than C3 plants. and C4 plants separate carbon fixation from the Calvin cycle.

What would happen if the stomata of a leaf remained closed all day? Select all that apply. (3) Carbon dioxide in the air spaces of the leaf would decrease. Oxygen in the air spaces would increase. The amount of water within the air spaces would decrease. Photorespiration would increase in C3 plants. Photorespiration would increase in CAM plants.

Carbon dioxide in the air spaces of the leaf would decrease. Oxygen in the air spaces would increase. Photorespiration would increase in C3 plants.

If plants were no longer able to perform the light reactions and they could only utilize the Calvin cycle, which of the following would be true? Select all that apply. Plants would not produce oxygen. G3P would be produced in much smaller quantities. NADPH production would decrease while ATP production increased. G3P would be produced in much greater quantities.

Plants would not produce oxygen. G3P would be produced in much smaller quantities.

The fixation of carbon dioxide in the first step of the Calvin cycle is facilitated by which enzyme? RuBP carboxylase glyceraldehyde-3-phosphate (G3P) PEP carboxylase lactate dehydrogenase

a. RuBP carboxylase

What is the ultimate destination for the energized electrons during the light reactions of photosynthesis? They are taken up by NADP+ to produce NADPH. They are taken up by NAD+ to produce NADH. They are taken up by NADPH to produce NADP+. They are taken up by NADH to produce NAD+.

a. They are taken up by NADP+ to produce NADPH.

What structure is required for an eukaryotic organism to be classified as an autotroph? chloroplast mitochondria nucleus Golgi body

a. chloroplast

While C4 plants have carbon dioxide fixation and carbon dioxide uptake separated by location within the plant, CAM plants have these processes separated by time. fix much greater amounts of carbon dioxide than C4 plants. are found in tropical regions where nutrients are abundant. have these processes separated among two leaf types.

a. have these processes separated by time.

The action spectrum of photosynthesis shows a high light absorption for violet/blue and orange/red and a low absorption for green/yellow. If we were to set up an experiment where narrow bands of unicolored light were shown on an aquatic plant such as Elodea, and we counted the number of bubbles of oxygen produced as an indicator of photosynthetic rate, how would the graph appear? just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green exactly inverted from the action spectrum with a peak for yellow/green perfectly flat because many wavelengths are used by chlorophyll a descending line because ultraviolet light has more energy than infrared There is no way to guess without actually running the experiment.

a. just like the action spectrum with peaks at violet/blue and orange/red and a trough at yellow/green

When an electron has been excited to a higher energy state, it can then drop back to the original level, re-emitting the light as fluorescence. When chlorophyll is extracted in solution, and a bright red or blue light is shown on it, the chlorophyll fluoresces brightly. However, when the chlorophyll is packaged inside chloroplasts and the red or blue light is turned on, there is no fluorescence. This most likely indicates that the red and blue light waves are reflected by the chlorophyll membrane. chlorophyll in solution is a different molecule than chlorophyll in a chloroplast. excited electrons are transferred to electron acceptors in the chloroplast. fluorescence does not work in living cells. green light must be used to make living cells fluoresce.

c. excited electrons are transferred to electron acceptors in the chloroplast.

_____ is a product of the Calvin cycle that is used to form glucose phosphate, amino acids or fatty acids. ATP ribulose bisphosphate (RuBP) glyceraldehyde-3-phosphate (G3P) PEP carboxylase (PEPcase) carbon dioxide

c. glyceraldehyde-3-phosphate (G3P)

What are the end products of photosynthesis? a. water and carbon dioxide b. water and oxygen c. oxygen and carbohydrate d. carbohydrate and water

c. oxygen and carbohydrate

Which of the following is a common photosynthetic pigment found in plants? Select all that apply. chlorophyll a chlorophyll c carotenoids chlorophyll b

chlorophyll a chlorophyll b and carotenoids

Protons (H+) accumulate in the thylakoid space during electron transport between photosystems II and I. Which of the following describes what will happen to these protons next? The protons will reenter the electron transport chain and be used to generate water. The protons will be used to oxidize NADPH to NADH, generating ATP in the process. The protons will diffuse out of the lipid layer surrounding the thylakoid and exit the plant during gas exchange. The protons will raise the pH of the thylakoid space until it becomes alkaline at which point the protons are pumped out of the thylakoid, generating ATP. The protons will move from the thylakoid space to the stroma through an ATP synthase complex that generates ATP.

e. The protons will move from the thylakoid space to the stroma through an ATP synthase complex that generates ATP.

G3P (glyceraldehyde-3-phosphate) can be used by plants to form which of the following? Select all that apply. fatty acids amino acids carbon dioxide starch NADPH

fatty acids, amino acids, and starch

A product of photosynthesis, _____, is the chief source of energy for most organisms. oxygen sucrose glucose All of the answer choices.

glucose

Oxygen production in photosynthesis involves which of the following? Select all that apply. photosystem I photosystem II splitting of water light reactions Calvin cycle

photosystem II splitting of water light reactions