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    Biology
    Grade-10
    Easy

    Question

    Where are the respiratory enzymes located?

    1. Mitochondrial matrix 
    2. Cristae 
    3. Chloroplast 
    4. Outer membrane 

    hintHint:

    Respiration is a process in which organisms metabolize their food to produce energy.
    Depending upon the use of molecular oxygen in oxidation, respiration can be of two types - aerobic and anaerobic respiration.
    It has three steps - Glycolysis, Krebs' cycle and electron transport chain.
    The enzymes of Krebs' cycle are present in the mitochondrial matrix. 

    The correct answer is: Mitochondrial matrix

      The respiratory enzymes are located in the Mitochondrial matrix
      • Most of the enzymes are involved in the citric acid cycle, and oxidative phosphorylation is a part of cellular respiration occurs exclusively in mitochondria.
      • These explain how oxidative phosphorylation, produce and create energy in the form of ATP molecules.
      • The Krebs cycle's enzymes are found in the mitochondrial matrix. The mitochondrial DNA (m-DNA) is also present in the matrix.
      • The presence of the enzymes promotes the oxidation of pyruvate, the citric acid cycle, oxidative phosphorylation, and beta-oxidation of fatty acids.
      • The majority of the enzymes are respiratory enzymes since they are engaged in the citric acid cycle and oxidative phosphorylation, both of which are aspects of cellular respiration.
      Hence the respiratory enzymes are present in the mitochondrial matrix. 

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