WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 5, Problem 4MC
Summary Introduction
To analyze:
The most responsible step for a plant’s acquisition of new organic material during photosynthesis.
Introduction:
Plants employ a process called photosynthesis to transform light energy into chemical energy that can then be released through
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Which of the following scenarios happens during the light-dependent reaction of photosynthesis?
Oxygen gas is produced in the thylakoid lumen by the oxidation of water by photosystem I.
Ferrodoxin and NADP+ reductase participates in the reduction of NADP+ to NADPH.
Carbon dioxide enters the plants via stomata.
Rubisco attaches three molecules of ribulose bisphosphate (RuBP) to one molecule of carbon dioxide.
Which of the following statements about the light reactions of photosynthesis is NOT true?
Chlorophyll and other pigments absorb light energy, which excites electrons
ATP is generated by photophosphorylation
Electrons from water are given to the chlorophyll molecules of Photosystem!
The splitting of water molecules provides a source of electrons
Carbon fixation in plants is catalyzed by what enzyme?
What is the name given to an organism (plant, bacteria or algae) that can produce its own food from organic molecules
specifically by using photosynthesis?
Which molecule leaves the Calvin cycle to be converted into glucose?
What is the overall purpose of cellular respiration in photosynthetic organisms? In which plant organ does photosynthesis most
commonly occur?
Question options:
the root
the stem
the leaf
the flower
Chapter 5 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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- Photosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.arrow_forwardMatch each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco functionarrow_forwardWhere in plant cells does the Calvin cycle take place? a. thylakoid membrane b. thylakoid space c. stroma d. granumarrow_forward
- Which of the following defines photorespiration? The metabolic pathway by which most autotrophs use the energy of light to make sugars from carbon dioxide and water The light-independent reactions of photosynthesis Process by which electron flow through electron transfer chains sets up a hydrogen ion gradient that drives ATP formation An inefficient metabolic pathway of producing sugars that occurs when O2 attaches to rubiscoarrow_forwardThe main purpose of the light reactions in photosynthesis is Group of answer choices to take the high energy electrons out of glucose. to generate ATP and NADPH to send to the Calvin Cycle. to produce all the ATP the plant cell needs for its cellular work. to produce enough oxygen gas for humans to survive.arrow_forwardA damage in the thylakoid membrane caused the protons to leak into the stroma. Which of the following processes will be most affected? * synthesis of ATP splitting of water absorption of light energy by chlorophyll flow of electrons from PSII to PSIarrow_forward
- What process or processes produce the proton gradient that powers ATP synthase in chloroplasts? (Select ALL correct answers) Protons are produced when water is split Protons are produced when NADP+ is reduced A proton pump uses light energy to move protons into the thylakoid space A proton pump uses energy from the electron transport chain to move protons into the thylakoid spacearrow_forwardPlace the following steps for one turn of the Calvin Cycle in the correct order. Carbon fixation Production of a 3-Carbon sugar Carbon dioxide (CO2) is taken into the plant. Carbon reduction Regeneration of RuBP (ribulose bisphosphate)arrow_forwardWhen chlorophyll absorbs the energy in sunlight, this energy: Activates electrons in chlorophyll Generates heat used by the plant for photosynthesis O Is used to break apart sugararrow_forward
- What is the overall outcome of the light reactions in photosynthesis? NADPH and ATP molecules are produced during the light reactions and are used to power the light independent reactions. NADPH and ATP molecules are produced during the light reactions, which are used to power the light dependent reactions. Sugar and ATP are produced during the light reactions, which are used to power the light independent reactions. Carbon dioxide and NADPH are produced during the light reactions, which are used to power the light dependent reactions.arrow_forwardIdentify the strategies that CAM (crassulacean acid metabolism) plants use to minimize water loss while obtaining CO2 (carbon dioxide) for photosynthesis. form a four-carbon molecule as the first step in fixing CO2 Okeep stomata closed throughout the hot and dry seasons Ostore carbon in vacuoles overnight and synthesize sugars during the day O conduct the Calvin cycle in bundle sheath cells instead of mesophyll cellsarrow_forwardThe most important result of the light-independent (or Calvin Cycle) reactions is: ??? the addition of phosphate to sugar to form sugar-phosphate the synthesis of sugar from CO2 the change of chlorophyll from green to colorless the transfer of electrons to glucose molecules the rearrangement of sugar molecules to form O2 from H2Oarrow_forward
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