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Photosynthesis and Chloroplast Structure in General Biology

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  • What is photosynthesis?
    Photosynthesis is the process that converts solar energy into chemical energy, producing oxygen and organic molecules like glucose.
  • Write the overall photosynthesis chemical equation.
    6CO\(_2\) + 6H\(_2\)O + light energy = C\(_6\)H\(_{12}\)O\(_6\) + 6O\(_2\)
  • Where in the plant does photosynthesis mainly occur?
    Photosynthesis mainly occurs in the leaves, specifically in the mesophyll cells.
  • What are stomata and their function?
    Stomata are openings in the leaf that allow CO\(_2\) to enter and O\(_2\) to exit.
  • Where in the cell does photosynthesis take place?
    Photosynthesis takes place in chloroplasts, which are found in the mesophyll of leaves.
  • Describe the structure of a chloroplast relevant to photosynthesis.
    Chloroplasts contain stacks called granum made of thylakoid sacs holding chlorophyll; the fluid inside is called stroma.
  • What role do chloroplasts play in photosynthesis?
    Chloroplasts split water into hydrogen and oxygen, incorporate hydrogen electrons into sugar, and release oxygen as a by-product.
  • What are the two main stages of photosynthesis?
    The two stages are the light-dependent reactions (photo) and the light-independent reactions (Calvin Cycle or synthesis).
  • Where do the light-dependent reactions occur and what happens?
    They occur in the thylakoid membrane, split water, release oxygen, and generate ATP and NADPH.
  • Where does the Calvin Cycle occur and what does it do?
    It occurs in the stroma, uses ATP and NADPH, and forms sugar from CO\(_2\).
  • What is a photosystem?
    A photosystem is a protein-pigment complex in the thylakoid membrane that harvests light energy.
  • How many photosystems are involved in photosynthesis and which comes first?
    There are two photosystems: Photosystem II comes first, followed by Photosystem I.
  • What wavelengths do Photosystem II and Photosystem I best absorb?
    Photosystem II absorbs best at 680 nm, and Photosystem I absorbs best at 700 nm.
  • Name the components embedded in the thylakoid membrane photosystem.
    Light-harvesting complexes, reaction center complex, primary electron acceptor, and a special pair of chlorophyll a molecules.
  • What is the function of the primary electron acceptor in a photosystem?
    It accepts excited electrons from the reaction center and becomes reduced.
  • What pigment gives leaves their green color?
    Chlorophyll, located in the thylakoid membranes, gives leaves their green color.