LAUNCHPAD F/WHAT IS LIFE
4th Edition
ISBN: 9781319231897
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 5, Problem 5MC
Summary Introduction
Introduction:
When the stomatal pores close, gas exchange is not possible.
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The light dependent reactions of photosynthesis are characterized by
A.
oxidation of carbon dioxide, release of oxygen, synthesis of glucose.
B.
release of oxygen, fixation of carbon dioxide, hydrolysis of ATP.
C.
oxidation of water, reduction of NADP+ , hydrolysis of ATP.
D.
reduction of oxygen, oxidation of NADPH, formation of ATP.
E.
oxidation of water, reduction of NADP+ , formation of ATP.
Which of the following options best explains how less chlorophyll would affect the proces of
photosynthesis in plants?
6.
A. It would increase the rate of photosynthesis because of the increased production of food.
B. It would limit the amount water plants are able to take in, resulting in a slower rate of
photosynthesis.
C. It would increase the production of oxygen because the plant would need to work hard to
feed themselves.
С.
D. It would limit the amount of light absorbed by the plant and decrease the amount of food
the plant is able to produce for itself.
In the photosynthetic formation of ATP, the enzyme ATP synthase couples the synthesis of ATP to:
A. the diffusion of protons
B. the reduction of NADP+
C. the excitation of chlorophyll
D. the reduction of chlorophyll
E. CO2 fixation
Chapter 5 Solutions
LAUNCHPAD F/WHAT IS LIFE
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- Match 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_forwardPhotosynthesis A. is the only energy-generating pathway for plants, cyanobacteria, and algae. B. consist two stages: light-dependent stage which fix CO₂, light-independent stage which generate glucose. C. can capture and convert energy from light to chemical energy in the form of ATP and NADPH. D. oxidize organic carbon molecule to CO₂, while reduce water to oxygen.arrow_forwardThe role of photosystem 1 and photosystem 2 in the process of photosynthesis is to a. absorb sunlight and distribute the energy as heat b. absorb sunlight and transfer the energy to electrons c. form ATP as hydrogen ions cross the thylakoid membrane d. transfer electrons to form NADPHarrow_forward
- Which of the following is true of chloroplastic ATP: Select one: a. it is made in the Calvin cycle and consumed in the light reactions b. it is used during photosynthesis, S assimilation, and N assimilation c. it does not leave the chloroplast, and is used to breakdown molecules d. it is made during photosynthesis and S assimilation e. it leaves the chloroplast, and is consumed in respiration and N assimilationarrow_forwardWhich of the following are the products of the light reactions of photosynthesis. A. Glucose B. Water C. ATP D.NADP E. Light energy F. NADPH G. Carbon dioxide H. Oxygenarrow_forwardWhich of the following statements about the challenges of C3 photosynthesis under hot conditions is TRUE? O When they close stomatal cells, they save water but lose too much O2. O Rubisco has a higher affinity for CO2, making the rate of photosynthesis too rapid. When stomatal cells close, photorespiration increases and CO2 is lost. C3 plants have to spend energy to store carbon in a separate specialized cell.arrow_forward
- Which of the following occurs ONLY in photosystem I and NOT in photosystem II? a. The energy of exited electrons is passed from one chlorophyll molecule to the next through resonance transfer b. Light energy is harvested by chlorophyll molecules c. A water molecule is split to provide electrons to a special chlorophyll A pair d. Energy harvested in the light-harvesting complexes excites electrons that can be used directly to reduce NADP+ to NADPH e. High-energy electrons are donated to an electron transport chainarrow_forwardWhich of the following changes would decrease ATP production in the light-dependent reactions of photosynthesis? a. decreasing the pH of the thylakoid lumen b. decreasing the pH of the chloroplast stroma c. increasing the concentration of NADP+ in the chloroplast stroma d. making the thylakoid membrane freely permeable to protons by adding a proton channel e. two of the above would decrease ATP productionarrow_forwardDuring the light-dependent reactions the high energy electron from P680. Select one: a. moves to Photosystem I b. becomes incorporated into water molecules c. is used to fix carbon dioxide d. is pumped into the thylakoid space e. reduces FADarrow_forward
- Consider the relationship between temperature and photosynthesis. As temperatures increase,gases such as CO2 diffuse faster. As a result, plant leaves will lose CO2 at a faster rate thannormal. If the amount of light reaching the leaf and the amount of water available are adequate,predict how this loss of gas will affect photosynthesis in the leaf.arrow_forwardWhich of the following is true of light-independent reactions of photosynthesis? Select all that apply. a. Light-independent reactions occur in the stroma. b. Water molecules are split during light-independent reactions. c. Chlorophyll absorbs energy from sunlight. d. Carbon dioxide is necessary for light-independent reactions.arrow_forwardThe chlorophyll in photosynthesis is used for: I. Absorbing light II. Breaking down water molecule III. No function IV. Reduction of CO2arrow_forward
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