ATP Structure and Function Quiz
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Questions and Answers

What is the primary role of chlorophyll b in photosynthesis?

  • It captures light energy and converts it into chemical energy.
  • It is the main pigment responsible for red leaf coloration.
  • It absorbs light energy and transfers it to chlorophyll a. (correct)
  • It protects against excessive sunlight damage.
  • Which pigment is primarily responsible for the yellow color in fall leaves?

  • Xanthophylls (correct)
  • Anthocyanins
  • Chlorophyll a
  • Carotenoids
  • Which accessory pigment does not participate in photosynthesis?

  • Chlorophyll b
  • Anthocyanins (correct)
  • Carotenoids
  • Xanthophylls
  • What distinguishes carotenoids from other accessory pigments?

    <p>They absorb light from violet to greenish-blue. (B)</p> Signup and view all the answers

    What is a function of xanthophylls in plants?

    <p>They act as antioxidants and assist in energy transfer. (B)</p> Signup and view all the answers

    What is energy coupling in cellular processes?

    <p>The transfer of energy from one reaction to another (D)</p> Signup and view all the answers

    Which reaction is an example of an energetically favorable process in energy coupling?

    <p>ATP hydrolysis (C)</p> Signup and view all the answers

    What is the role of chlorophyll in photosynthesis?

    <p>It absorbs light energy to drive the formation of glucose (B)</p> Signup and view all the answers

    Why do leaves appear green to our eyes?

    <p>They reflect green light and absorb others (C)</p> Signup and view all the answers

    What are accessory pigments in plants?

    <p>Pigments that absorb light in wavelengths chlorophyll cannot (A)</p> Signup and view all the answers

    In the coupled reaction to form sucrose, which intermediate is formed from ATP?

    <p>Glucose-P (B)</p> Signup and view all the answers

    What happens to light wavelengths absorbed by chlorophyll?

    <p>They are transformed into chemical energy (D)</p> Signup and view all the answers

    What characteristic determines the color of pigments in plants?

    <p>The absorption spectrum of wavelengths (C)</p> Signup and view all the answers

    What is the primary purpose of ATP in living organisms?

    <p>Short-term energy storage and transport (C)</p> Signup and view all the answers

    What happens to ATP when it undergoes hydrolysis?

    <p>It releases energy and becomes ADP (A)</p> Signup and view all the answers

    Which part of the ATP molecule is broken during the hydrolysis reaction?

    <p>The bond between the second and third phosphate groups (C)</p> Signup and view all the answers

    How does the energy released by ATP hydrolysis affect nearby molecules?

    <p>It leads to overheating and thermal energy (C)</p> Signup and view all the answers

    What is produced when ATP is broken down through hydrolysis?

    <p>Adenosine diphosphate (ADP) and a free phosphate group (C)</p> Signup and view all the answers

    What characteristic of the three phosphate groups in ATP contributes to its instability?

    <p>They are all negatively charged (A)</p> Signup and view all the answers

    In the ATP-ADP energy cycle, what occurs after ATP has released energy?

    <p>ADP must be recharged to form ATP again (B)</p> Signup and view all the answers

    What energy-using cellular process does ATP directly support?

    <p>Cell division (A)</p> Signup and view all the answers

    Flashcards

    ATP

    Adenosine triphosphate; organic molecule for short-term energy storage and transport.

    Hydrolysis

    Water-mediated breakdown of chemical bonds, releasing energy.

    ADP

    Adenosine diphosphate; a low-energy molecule formed from ATP when energy is released.

    ATP-ADP Cycle

    The reversible process of ATP hydrolysis to ADP and then the regeneration of ATP.

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    Energy Coupling

    Using energy released during ATP hydrolysis to drive cellular processes or reactions.

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    Plant Pigments

    Essential molecules in plants involved in capturing light energy.

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    Cellular Processes

    Activities that occur inside cells requiring energy, e.g., protein synthesis.

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    ATP Structure

    An organic molecule composed of adenine (nitrogenous base), ribose (sugar), and three phosphate groups.

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    Chlorophyll b

    A pigment that absorbs light in the blue and orange-red ranges, appearing yellowish green. It transfers captured energy to chlorophyll a.

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    Carotenoids

    Pigments absorbing light from violet to greenish-blue, appearing yellow or orange. They efficiently pass absorbed photons to chlorophyll a.

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    Anthocyanins

    Pigments that don't directly participate in photosynthesis, appearing red, purple, or blue. They protect plants from excessive sunlight.

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    Xanthophylls

    Pigments that absorb light energy and pass it to chlorophyll a, also acting as antioxidants.

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    What do chlorophyll b, carotenoids, and xanthophylls have in common?

    They all capture light energy and transfer it to chlorophyll a, which is the primary photosynthetic pigment.

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    Exergonic Reaction

    A chemical reaction that releases energy into the surroundings, often through the breaking of bonds.

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    Endergonic Reaction

    A chemical reaction that requires energy input from the surroundings, often to form bonds.

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    ATP Hydrolysis

    The breakdown of ATP into ADP and a phosphate group, releasing energy.

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    ATP Regeneration

    The process of adding a phosphate group back to ADP to create ATP, requiring energy input.

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    Accessory Pigments

    Pigments in plants that absorb wavelengths of light not absorbed by chlorophyll, increasing the range of light used for photosynthesis.

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    Photosynthesis

    The process by which plants use light energy, carbon dioxide and water to produce glucose (food) and oxygen.

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    Study Notes

    ATP Structure and Function

    • ATP is an organic molecule used for short-term energy storage and transport in cells
    • It consists of three parts: adenine (a nitrogenous base), ribose (a sugar), and three phosphate groups (triphosphate)
    • The phosphate groups are negatively charged, making them unstable and prone to repulsion
    • Hydrolysis (breaking down with water) of the phosphate bonds in ATP releases energy
    • The breakdown results in adenosine diphosphate (ADP) and inorganic phosphate (Pi)

    ATP-ADP Cycle

    • ATP and ADP are like charged and uncharged forms of a rechargeable battery
    • ATP (charged) has energy for cellular processes
    • ADP (uncharged) needs recharging to be a power source
    • ATP regeneration is the reverse of hydrolysis reaction
      • Energy + ADP + Pi → ATP + H₂O

    Energy Coupling

    • Energy coupling links an exergonic reaction (releases energy, e.g., ATP hydrolysis) with an endergonic reaction (absorbs energy, e.g., ATP regeneration)
    • This enables cells to perform necessary tasks
    • Chemical reactions are either exergonic (release energy) or endergonic (absorb energy)

    Examples of Energy Coupling

    • Formation of sucrose (table sugar) from glucose and fructose is an example
      • A phosphate group is transferred from ATP to glucose, forming glucose-P (energy-releasing)
      • The glucose-P is converted into sucrose (energy is released as the reaction is spontaneous)

    Plant Pigments

    • Pigments absorb light from the sun
    • Color variations in plants are due to different amounts and types of pigments
    • Chlorophyll is a key pigment in leaves, absorbing light energy for photosynthesis
    • It reflects green light, so plants appear green
    • Other pigments (accessory pigments) absorb other wavelengths of light, extending the range of light used for photosynthesis
    • These accessory pigments include chlorophyll b, carotenoids, and anthocyanins
    • The pigments absorb different wavelengths of visible light (red, orange, yellow, green, blue, indigo, violet) to carry out their function

    Location of Pigments in Plants

    • Photosynthetic cells (mesophyll cells) contain specialized structures called chloroplasts
    • Chloroplasts house chlorophyll and other pigments
    • Pigments not involved in photosynthesis are stored in the vacuole

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    Description

    Test your understanding of ATP, its structure, and its critical role in energy transfer within cells. This quiz covers the ATP-ADP cycle and the principles of energy coupling, essential for cellular metabolism. Dive in to see how this molecule powers life!

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