Biology Chapter 7: Photosynthesis Flashcards
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Questions and Answers

Which color(s) of light would be most beneficial to a plant with carotenoids but no chlorophyll?

  • Violet-blue (correct)
  • Yellow
  • Red
  • Green
  • Which three statements about plant pigments are true? (Select all that apply)

  • Different pigments in plant chloroplasts absorb light of different wavelengths. (correct)
  • Visible light that is not absorbed by chloroplast pigments determines what color a plant will appear to your eye. (correct)
  • All pigments absorb light equally.
  • The orange and yellow colors of fall foliage are mostly due to carotenoids in the plants. (correct)
  • What process is involved in ATP synthesis in both chloroplasts and mitochondria?

    chemiosmosis

    In both cellular respiration and photosynthesis, a(n) __________ built into a membrane pumps H+ across the membrane as electrons are passed from one electron carrier to the next.

    <p>electron transport chain</p> Signup and view all the answers

    In respiration, the electrons come from the oxidation of organic molecules, and __________ is the final electron acceptor.

    <p>oxygen</p> Signup and view all the answers

    In photosynthesis, the electrons come from water and end up in _______.

    <p>NADPH</p> Signup and view all the answers

    In photosynthesis, __________ drives electrons from a low-energy state in water to a high-energy state.

    <p>light energy</p> Signup and view all the answers

    In both respiration and photosynthesis, the potential energy of a(n) __________ is tapped to drive the phosphorylation of ADP to ATP.

    <p>H+ concentration gradient</p> Signup and view all the answers

    As H+ diffuses back through __________ (an enzyme complex embedded in the membrane), ATP is produced.

    <p>ATP synthase</p> Signup and view all the answers

    Why is bioethanol often added to gasoline?

    <p>Ethanol is a renewable resource that can increase fuel efficiency and lower vehicle emissions.</p> Signup and view all the answers

    Which of the following is a good reason for using fast-growing trees as fuel?

    <p>Vigorously growing plants remove a lot of carbon dioxide from the air.</p> Signup and view all the answers

    Global climate change could be magnified by __________.

    <p>deforestation</p> Signup and view all the answers

    Which of the following best describes some of the benefits of photosynthesis?

    <p>It is an oxygen source as well as a source of stored energy.</p> Signup and view all the answers

    Forests are considered carbon storage sinks because __________.

    <p>carbon dioxide is used in the Calvin cycle to make glucose, which is used to make wood and other tree molecules</p> Signup and view all the answers

    Directed evolution of biofuels refers to__________.

    <p>mutation, screening, and selection of microscopic algae that produce large quantities of biofuels</p> Signup and view all the answers

    The end products of photosynthesis are __________ and __________.

    <p>glucose, molecular oxygen</p> Signup and view all the answers

    Which of the following is produced by the light reactions of photosynthesis and is consumed by the Calvin cycle?

    <p>NADPH</p> Signup and view all the answers

    The product of photosynthesis is _____.

    <p>sugar</p> Signup and view all the answers

    _____ is used in the light reactions, and ______________ is used in the Calvin cycle.

    <p>water, carbon dioxide</p> Signup and view all the answers

    ________ and ________ store energy from the light reactions for use in the Calvin cycle.

    <p>NADPH, ATP</p> Signup and view all the answers

    _______ is a waste product of photosynthesis.

    <p>oxygen</p> Signup and view all the answers

    The carbon dioxide that enters a leaf is the source of carbon for much of the body of the plant, including the sugars and starches that we eat.

    <p>Pathways that transform energy and matter</p> Signup and view all the answers

    Chloroplasts contain several different pigments of different molecular shapes that absorb light of different wavelengths.

    <p>Relationship of structure to function</p> Signup and view all the answers

    To improve biofuel production, algae are exposed to mutation-promoting chemicals. This produces a highly varied collection of algae that can be screened for the ability to produce the most useful biofuel in the largest quantity.

    <p>Evolution</p> Signup and view all the answers

    Deforestation, which removes a lot of photosynthetic plant life, thereby reduces the ability of the biosphere to absorb carbon.

    <p>Interactions within biological systems</p> Signup and view all the answers

    Carbon fixation involves the addition of carbon dioxide to _____.

    <p>RuBP</p> Signup and view all the answers

    After 3-PGA is phosphorylated, it receives energized electrons from _____.

    <p>NADPH</p> Signup and view all the answers

    How many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose?

    <p>6</p> Signup and view all the answers

    In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?

    <p>3</p> Signup and view all the answers

    Photosynthetic organisms include __________.

    <p>protists and bacteria</p> Signup and view all the answers

    Which wavelength(s) of light is/are best absorbed by the chlorophyll in plants?

    <p>blue and red</p> Signup and view all the answers

    Where is chlorophyll found in chloroplasts?

    <p>in thylakoids</p> Signup and view all the answers

    What provides the energy to drive the photosynthesis chemical reaction?

    <p>sunlight</p> Signup and view all the answers

    What are the reactants for photosynthesis?

    <p>CO2 and H2O</p> Signup and view all the answers

    Which of the following is the process that ultimately feeds the world?

    <p>Photosynthesis</p> Signup and view all the answers

    Why are leaves green?

    <p>The chlorophyll and other pigments reflect green light while absorbing other light.</p> Signup and view all the answers

    What part of a plant can be termed its 'food factory'?

    <p>leaves</p> Signup and view all the answers

    The mass of a plant comes from __________.

    <p>carbon</p> Signup and view all the answers

    Which stage is responsible for completing the breakdown of glucose all the way to CO2?

    <p>Citric acid cycle</p> Signup and view all the answers

    Which of the following occurs in the first photosystem?

    <p>Photons excite electrons for transfer to an electron transport chain</p> Signup and view all the answers

    Which metabolic pathways directly involve oxygen?

    <p>Photosynthesis and the electron transport chain</p> Signup and view all the answers

    What do cell respiration and photosynthesis have in common?

    <p>Both produce (and use) ATP.</p> Signup and view all the answers

    Stroma is the __________.

    <p>thick fluid found inside the chloroplast</p> Signup and view all the answers

    What are the products of photosynthesis?

    <p>O2 and glucose</p> Signup and view all the answers

    A plant requires which of the following for growth?

    <p>Sunlight, H2O, and CO2</p> Signup and view all the answers

    How is breathing related to cellular respiration?

    <p>When you inhale you breathe in O2 which is delivered to your cells and is used during cellular respiration. CO2 is a waste product of cellular respiration and is exhaled.</p> Signup and view all the answers

    Which of the following depicts the correct order of the light reactions of photosynthesis?

    <p>light capture -&gt; electron excitation -&gt; electron transport -&gt; making ATP -&gt; making NADPH</p> Signup and view all the answers

    What pathway in photosynthesis captures carbon dioxide?

    <p>The Calvin cycle</p> Signup and view all the answers

    When oxygen is released as a result of photosynthesis, what is its source?

    <p>Splitting of H2O</p> Signup and view all the answers

    Which of the following are needed for the Calvin cycle?

    <p>ATP, NADPH, and carbon</p> Signup and view all the answers

    Using the energy from light, what is the initial electron donor in photosynthesis?

    <p>Chlorophyll</p> Signup and view all the answers

    About _________ of the energy produced by your body each day is used to sustain your brain.

    <p>20%</p> Signup and view all the answers

    What is the end result of the Calvin cycle?

    <p>sugar is produced</p> Signup and view all the answers

    Which of these equations best summarizes photosynthesis?

    <p>6 CO2 + 6 H2O → C6H12O6 + 6 O2</p> Signup and view all the answers

    Where does the Calvin cycle occur?

    <p>stroma</p> Signup and view all the answers

    The light reactions of photosynthesis use _____ and produce _____.

    <p>water, NADPH</p> Signup and view all the answers

    Which of the following equations represents photosynthesis?

    <p>6CO2 + 6H2O → C6H12O6 + 6O2</p> Signup and view all the answers

    In which of the following organelles does photosynthesis take place?

    <p>Chloroplast</p> Signup and view all the answers

    What connects the two photosystems in the light reactions?

    <p>An electron transport chain</p> Signup and view all the answers

    What two molecules are produced by the light reactions and used to power the Calvin cycle?

    <p>ATP and NADPH</p> Signup and view all the answers

    What provides electrons for the light reactions?

    <p>H2O</p> Signup and view all the answers

    What provides the carbon atoms that are incorporated into sugar molecules in the Calvin cycle?

    <p>Carbon Dioxide (CO2)</p> Signup and view all the answers

    What transports electrons from the light reactions to the Calvin cycle?

    <p>NADPH</p> Signup and view all the answers

    The light reactions take place in the _________ and the Calvin cycle takes place in the _________.

    <p>thylakoids, stroma</p> Signup and view all the answers

    The radioactive isotope used in the Calvin experiments was ____.

    <p>carbon 14</p> Signup and view all the answers

    The Calvin cycle describes the conversion of ___.

    <p>carbon dioxide to carbohydrates</p> Signup and view all the answers

    Paper chromatography is used to _____.

    <p>separate components in a material of interest</p> Signup and view all the answers

    What type of organism was used in Calvin's experiments?

    <p>algae</p> Signup and view all the answers

    Plants are photosynthetic autotrophs. What does this mean?

    <p>They use light energy to drive the synthesis of organic molecules.</p> Signup and view all the answers

    The ultimate energy source that supports most life on Earth is __________.

    <p>sunlight</p> Signup and view all the answers

    Where does the energy for the Calvin cycle come from?

    <p>NADPH and ATP</p> Signup and view all the answers

    The overall function of the Calvin cycle is __________.

    <p>making sugar</p> Signup and view all the answers

    When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by other electrons obtained by __________.

    <p>splitting water</p> Signup and view all the answers

    Global climate change could be magnified by __________.

    <p>deforestation</p> Signup and view all the answers

    Study Notes

    Photosynthesis Overview

    • Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy.
    • It takes place in chloroplasts, specifically in the thylakoids and stroma.
    • The overall equation summarizing photosynthesis is 6 CO2 + 6 H2O → C6H12O6 + 6 O2.

    Key Components and Processes

    • Light reactions occur in thylakoids and require water, producing NADPH and ATP.
    • The Calvin cycle occurs in the stroma, utilizing ATP, NADPH, and CO2 to produce sugar.
    • The process begins when light strikes chlorophyll, exciting electrons that are replenished by splitting water.

    Pigments and Light Absorption

    • Photosynthetic pigments include chlorophyll and carotenoids, which absorb specific wavelengths of light (blue and red for chlorophyll, violet-blue for carotenoids).
    • Colors not absorbed by pigments dictate the visible appearance of the plant.
    • Carotenoids contribute to the orange and yellow hues seen in fall foliage due to their prominence when chlorophyll breaks down.

    Energy and Electron Transport

    • ATP synthesis in chloroplasts is driven by chemiosmosis and the H+ ion concentration gradient, facilitated by ATP synthase.
    • In cellular respiration, oxygen serves as the final electron acceptor; in photosynthesis, electrons are sourced from water.

    Environmental Impact and Biofuels

    • Deforestation reduces the biosphere's ability to absorb carbon dioxide, exacerbating global climate change.
    • Fast-growing trees can offset carbon emissions and are viable as renewable energy sources.
    • Directed evolution can enhance biofuel production through the mutation and selection of algae.

    Carbon Fixation and Sugars

    • The Calvin cycle involves carbon fixation, where CO2 is added to RuBP to form 3-PGA, eventually producing glucose.
    • A total of six CO2 molecules are required to produce one glucose molecule.

    Roles of CO2 and Water

    • CO2 is a primary source of carbon for plant structure, leading to biomass.
    • Water is essential in light reactions, providing electrons and eventually yielding oxygen as a waste product.

    Impact on Life and Climate

    • Photosynthesis contributes to oxygen production and serves as a foundational energy source for life on Earth.
    • The mass of a plant is primarily derived from carbon absorbed from the air, illustrating the importance of atmospheric CO2.

    Experimental Insights

    • Calvin's experiments utilized carbon-14 as a radioactive isotope to trace carbon incorporation in sugars.
    • Paper chromatography is used to separate different pigments, aiding in the study of photosynthetic processes.

    Key Terms

    • Autotrophs: Organisms that produce their own food using light energy.
    • Electron transport chain: A series of redox reactions that assist in ATP synthesis during both photosynthesis and cellular respiration.
    • Stroma: The fluid-filled space within chloroplasts where the Calvin cycle takes place.

    Summary

    • Understanding photosynthesis is crucial as it underpins the energy flow in ecosystems and addresses environmental concerns like climate change and renewable energy sources.

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    Test your understanding of photosynthesis and plant pigments with these flashcards. Explore the role of light and pigments like carotenoids and chlorophyll in the process of making food. Perfect for reinforcing key concepts from Chapter 7!

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