Light-dependent Reaction

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Light-dependent Reaction - Quiz

How big of a science buff are you? Take this light-dependent reaction quiz to find out. It is more than just the conversion of light energy into chemical energy. Light-dependent reactions are a series of chemical reactions that are an integral component of photosynthesis. Challenge yourself with these brain-tickling questions and play along with your friends to maximize the fun.


Questions and Answers
  • 1. 

    What is not found in a photosystem?

    • A.

      Chlorophyll a molecules

    • B.

      Accessory pigments

    • C.

      Antenna complex

    • D.

      Cytochrome complex

    Correct Answer
    D. Cytochrome complex
    Explanation
    A photosystem is a complex of pigments and proteins found in the thylakoid membrane of chloroplasts. It is responsible for capturing light energy and converting it into chemical energy during photosynthesis. Chlorophyll a molecules, accessory pigments, and antenna complexes are all components of a photosystem and play a crucial role in light absorption and energy transfer. However, a cytochrome complex is not found in a photosystem. Cytochromes are proteins involved in electron transport chains, which are located in the inner mitochondrial membrane, not in the chloroplasts where photosystems are found.

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  • 2. 

    Which photosystem does the light-dependent reaction begin with?

    • A.

      Photosystem I

    • B.

      Photosystem II

    • C.

      Photosystem |||

    • D.

      Photosystem V

    Correct Answer
    B. Photosystem II
  • 3. 

    Light absorbed by photosystem II serves to excite electrons in what molecules?

    • A.

      Chlorophyll b molecules

    • B.

      Chlorophyll a molecules

    • C.

      Accessory pigment molecules

    • D.

      Chlorophyll c molecules

    Correct Answer
    B. Chlorophyll a molecules
  • 4. 

    After the excited electrons are captured by the primary electron acceptor, water is split in a process known as what?

    • A.

      Photolysis

    • B.

      Photosynthesis

    • C.

      Photophosphorylation

    • D.

      Chemiosmosis

    Correct Answer
    A. Photolysis
    Explanation
    After the excited electrons are captured by the primary electron acceptor, water is split in a process known as photolysis. This is the process where water molecules are broken down into oxygen, protons (H+), and electrons. Photolysis occurs during the light-dependent reactions of photosynthesis, specifically in the thylakoid membrane of chloroplasts. It is an essential step in the production of oxygen and the generation of energy-rich molecules like ATP and NADPH.

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  • 5. 

    As the excited electrons lose energy along the electron transport chain, they fuel the process of:

    • A.

      Light absorption

    • B.

      Chemiosmosis

    • C.

      Photolysis

    • D.

      Photosynthesis

    Correct Answer
    B. Chemiosmosis
    Explanation
    As the excited electrons lose energy along the electron transport chain, they fuel the process of chemiosmosis. Chemiosmosis is the movement of ions across a selectively permeable membrane, which generates ATP (adenosine triphosphate), the energy currency of cells. In this process, the energy released by the flow of electrons is used to pump protons across the membrane, creating an electrochemical gradient. This gradient is then used by ATP synthase to produce ATP. Therefore, chemiosmosis is the correct answer as it accurately describes the process by which the excited electrons contribute to the production of ATP.

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  • 6. 

    When photosystem I absorb light and transfers an electron to a primary electron acceptor, an electron from _____________ fills the void.

    • A.

      The cytochrome complex

    • B.

      A chlorophyll a molecule

    • C.

      Antenna complex

    • D.

      Photosystem II

    Correct Answer
    D. Photosystem II
  • 7. 

    After the electron from photosystem I is transferred to the primary electron acceptor, it is passed along the electron transport chain by the carrier _____________.

    • A.

      Oxycontin

    • B.

      Cytochrome complex

    • C.

      Ferredoxin

    • D.

      Chloroplast

    Correct Answer
    C. Ferredoxin
  • 8. 

    After NADP reductase transfers the electron from ferredoxin to NADP+, the NADP+ requires how many electrons so that it can be reduced into NADPH?

    • A.

      1

    • B.

      4

    • C.

      3

    • D.

      2

    Correct Answer
    D. 2
  • 9. 

    What are the products of the light-dependent reaction?

    • A.

      NADPH and ATP

    • B.

      Glucose

    • C.

      Ferredoxin

    • D.

      Glucose and ATP

    Correct Answer
    A. NADPH and ATP
  • 10. 

    In which state of photosynthesis is light energy is converted into chemical energy?

    • A.

      First stage

    • B.

      Second stage

    • C.

      Third stage

    • D.

      Fourth stage

    Correct Answer
    A. First stage
    Explanation
    In the first stage of photosynthesis, known as the light-dependent reactions, light energy is converted into chemical energy. This occurs in the thylakoid membranes of the chloroplasts, where pigments such as chlorophyll absorb light and use it to generate ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate), which are energy-rich molecules. These molecules are then used in the second stage, the light-independent reactions, to convert carbon dioxide into glucose through a process called the Calvin cycle. Therefore, the correct answer is the first stage.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 14, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 03, 2009
    Quiz Created by
    Nmwhite0131
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