Physics: Light-independent Reaction Quiz Questions!

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Physics: Light-independent Reaction Quiz Questions! - Quiz

A quiz over the light-independent reaction!


Questions and Answers
  • 1. 

    Where does the light-independent reaction occur?

    • A.

      Stroma

    • B.

      Mitochondria

    • C.

      Thylakoid

    Correct Answer
    A. Stroma
    Explanation
    The light-independent reaction, also known as the Calvin cycle, occurs in the stroma of the chloroplast. This is where carbon dioxide is converted into glucose using the energy and ATP generated during the light-dependent reactions that occur in the thylakoid membranes. The stroma provides the necessary enzymes and coenzymes for the fixation and reduction of carbon dioxide, allowing the production of glucose and other organic compounds. The mitochondria, on the other hand, are responsible for cellular respiration and do not play a direct role in the light-independent reaction.

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  • 2. 

    What provides the energy for the light-independent reaction?

    • A.

      Sunlight

    • B.

      ATP from neighboring mitochondria

    • C.

      NADPH and ATP from the light-dependent reaction

    Correct Answer
    C. NADPH and ATP from the light-dependent reaction
    Explanation
    The light-independent reaction, also known as the Calvin cycle, is the process in photosynthesis where carbon dioxide is converted into glucose. This reaction requires energy to occur, which is provided by NADPH and ATP. NADPH is a molecule that carries high-energy electrons, while ATP is a molecule that stores and releases energy. Both NADPH and ATP are produced during the light-dependent reaction, which takes place in the thylakoid membrane of chloroplasts. Therefore, NADPH and ATP from the light-dependent reaction provide the energy needed for the light-independent reaction.

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  • 3. 

    A main part of the light-independent reaction, the Calvin Cycle, involves three main steps. These include _______________, reduction, and regeneration of RuBP.

    • A.

      Light absorption

    • B.

      Carbon fixation

    • C.

      Sodium transport

    Correct Answer
    B. Carbon fixation
    Explanation
    The correct answer is carbon fixation. In the light-independent reaction, also known as the Calvin Cycle, carbon dioxide molecules are converted into organic molecules through a process called carbon fixation. This involves the enzyme RuBisCO combining carbon dioxide with a five-carbon compound called RuBP to form an unstable six-carbon compound. This compound then breaks down into two molecules of a three-carbon compound called PGA, which is further converted into glucose and other organic molecules. Carbon fixation is a crucial step in the Calvin Cycle as it allows the incorporation of carbon dioxide into organic compounds.

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  • 4. 

    What catalyzes carbon fixation?

    • A.

      Ferredoxin

    • B.

      NADP reductase

    • C.

      Rubisco

    Correct Answer
    C. Rubisco
    Explanation
    Rubisco is the correct answer because it is an enzyme that catalyzes the first step of carbon fixation in photosynthesis. It combines carbon dioxide with a five-carbon sugar called ribulose-1,5-bisphosphate (RuBP) to form two molecules of a three-carbon compound called 3-phosphoglycerate (PGA). Rubisco is considered one of the most abundant enzymes on Earth and plays a crucial role in converting atmospheric carbon dioxide into organic compounds that can be used by plants and other organisms for energy and growth.

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  • 5. 

    Carbon fixation binds a carbon dioxide molecule to a 5-carbon compound known as _____________, creating an unstable 6-carbon compound.

    • A.

      Rubisco

    • B.

      RuBP

    • C.

      Ribonuclease

    Correct Answer
    B. RuBP
    Explanation
    Carbon fixation is the process by which carbon dioxide is converted into organic compounds. In this process, a carbon dioxide molecule is bound to a 5-carbon compound called RuBP (ribulose-1,5-bisphosphate), resulting in the formation of an unstable 6-carbon compound. This reaction is catalyzed by the enzyme rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase), which plays a crucial role in photosynthesis. Ribonuclease, on the other hand, is an enzyme involved in the degradation of RNA and is not related to carbon fixation. Therefore, the correct answer is RuBP.

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  • 6. 

    The unstable 6-carbon compound breaks down into:

    • A.

      2, 3-carbon compounds

    • B.

      3, 2-carbon compounds

    • C.

      6, 1-carbon compounds

    Correct Answer
    A. 2, 3-carbon compounds
    Explanation
    When the unstable 6-carbon compound breaks down, it forms 2, 3-carbon compounds. This means that the original compound splits into two separate molecules, each containing three carbon atoms. This breakdown could occur through a variety of chemical reactions, such as fragmentation or decomposition. The resulting 3-carbon compounds may have different structures and properties compared to the original compound.

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  • 7. 

    In the process of ____________, ATP and NADPH act upon these two 3-carbon compounds to create triose phosphate.

    • A.

      Production

    • B.

      Reduction

    • C.

      Seduction

    Correct Answer
    B. Reduction
    Explanation
    In the process of reduction, ATP and NADPH act upon these two 3-carbon compounds to create triose phosphate. Reduction is a chemical reaction that involves the gain of electrons or a decrease in oxidation state. In this case, ATP and NADPH provide the necessary energy and reducing power to convert the 3-carbon compounds into triose phosphate. This process is essential in many biological pathways, including photosynthesis and cellular respiration, as it helps in the production of energy-rich molecules.

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  • 8. 

    Some triose phosphates leave the cycle to become complex carbohydrates; others remain in order to regenerate ____________.

    • A.

      Rubisco

    • B.

      RuBP

    • C.

      Ribonuclease

    Correct Answer
    B. RuBP
    Explanation
    Some triose phosphates leave the cycle to become complex carbohydrates, while others remain in order to regenerate RuBP. RuBP, or ribulose-1,5-bisphosphate, is a molecule that plays a crucial role in the Calvin cycle, which is the process by which plants convert carbon dioxide into glucose. By regenerating RuBP, the cycle can continue and more carbon dioxide can be fixed. Rubisco, on the other hand, is the enzyme responsible for catalyzing the first step of carbon fixation in the Calvin cycle. Ribonuclease is not relevant to the regeneration of RuBP in this context.

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  • 9. 

    _______ is used to gain RuBP from the triose phosphate compounds.

    • A.

      NADPH

    • B.

      ATP

    • C.

      Rubisco

    Correct Answer
    B. ATP
    Explanation
    ATP is used to gain RuBP from the triose phosphate compounds. ATP provides the necessary energy for the conversion of triose phosphate into RuBP during the Calvin cycle of photosynthesis. This conversion is essential for the regeneration of RuBP, which is a crucial molecule in the carbon fixation process.

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  • 10. 

    What is the main product of the Calvin Cycle?

    • A.

      RuBP

    • B.

      Rubisco

    • C.

      Glucose

    Correct Answer
    C. Glucose
    Explanation
    The main product of the Calvin Cycle is glucose. The Calvin Cycle is a series of biochemical reactions that occur in the chloroplasts of plants during photosynthesis. It involves the conversion of carbon dioxide into glucose, which is a sugar molecule that serves as a source of energy for the plant. Glucose is essential for the growth and development of plants, as well as for the production of other important molecules such as starch and cellulose.

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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
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 03, 2009
    Quiz Created by
    Nmwhite0131
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