What is a Chloroplast?
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Questions and Answers

What is the primary function of chloroplasts in plant cells?

  • To regulate cell growth
  • To produce energy (correct)
  • To store energy
  • To synthesize proteins
  • What is the name of the green pigment found in chloroplasts?

  • Chloroplastin
  • Chlorophyll (correct)
  • Chlorophyllin
  • Chlorin
  • What is the name of the organelles involved in food creation and storage?

  • Lysosomes
  • Mitochondria
  • Golgi apparatus
  • Plastids (correct)
  • What is the term for the stacks of thylakoids found in chloroplasts?

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

    What is the term for undifferentiated plastids that could mature into different types of plastids?

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

    What is the function of chromoplasts?

    <p>To contain pigments of other colors</p> Signup and view all the answers

    What is the result of chloroplasts being present in the mesophyll of plant leaves?

    <p>Leaves appear green</p> Signup and view all the answers

    What is the main function of the chloroplast?

    <p>To capture energy from the light of the sun and convert it into cellular energy</p> Signup and view all the answers

    What is the fluid that surrounds the thylakoids within the inner membrane?

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

    What is the name of the channels that connect the grana to each other?

    <p>Stroma lamellae</p> Signup and view all the answers

    Where does the light-dependent step of photosynthesis take place?

    <p>In the lumen and membrane of the thylakoid system</p> Signup and view all the answers

    What is the shape of a typical chloroplast?

    <p>Round and oval or disc-shaped</p> Signup and view all the answers

    What is the purpose of the stroma in chloroplasts?

    <p>To contain chloroplast DNA, ribosomes, and many proteins and starches</p> Signup and view all the answers

    What is the role of chlorophyll in photosynthesis?

    <p>To capture energy from the light of the sun</p> Signup and view all the answers

    What is unique about the shape of algal chloroplasts?

    <p>They come in a variety of shapes and sizes</p> Signup and view all the answers

    Study Notes

    What is a Chloroplast?

    • A chloroplast is an organelle in plant cells responsible for producing energy through photosynthesis.
    • It is a type of plastid, involved in food creation and storage.

    Chloroplast Structure

    • Chloroplasts have a double membrane structure.
    • They contain stacks of thylakoids called grana.
    • The stroma is the aqueous fluid surrounding the thylakoids, containing chloroplast DNA, ribosomes, and proteins and starches.
    • Thylakoids are small discs containing lumen (aqueous fluid) and chlorophyll.
    • Stroma lamellae are channels connecting grana to each other, allowing for broader light capture.

    Chloroplast Function

    • Chloroplasts capture energy from sunlight and convert it into cellular energy (ATP) for the plant or algae.
    • They produce sugar and oxygen through photosynthesis, using carbon dioxide, light, and water.

    Photosynthesis Process

    • Light-dependent steps occur in the lumen and membrane of the thylakoid system.
    • Light-independent steps occur in the stroma.
    • Chlorophyll in the grana catches sunlight, allowing photophosphorylation of ADP to produce ATP and NADPH.
    • ATP and NADPH are used in the stroma to turn carbon dioxide and water into carbohydrates and oxygen.

    Chloroplasts in Algae

    • Algal chloroplasts vary in size and shape, depending on the type of algae and cell location.
    • They can be lens-shaped, cup-shaped, helical, star-shaped, plate-like, or other shapes.
    • The number and size of chloroplasts in a cell vary, but all are green due to chlorophyll.

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    Description

    Learn about chloroplasts, organelles in plant cells that produce energy, and their role in creating ATP for cellular energy.

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