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Respiration in Plants Test - 23

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Respiration in Plants Test - 23
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Degradation of sugar and fat to Acetyl CoA will not take place if this organelle is not present in a eukaryotic cell. Which organelle is that?
    Solution
    Degradation of sugar and fat to form acetyl-CoA is the initial step in Krebs cycle. Krebs cycle takes place in mitochondria, which is called as the power house of cell. In aerobic respiration, major reactions take place in mitochondria. So, without it, aerobic respiration can not be completed.
  • Question 2
    1 / -0
    The product formed by malic acid dehydrogenase is 
    Solution
    Oxaloacetic acid is produced as a result of the catalytic activity of malic dehydrogenase on malate. This reaction is a step in TCA cycle. In this reaction, NADH is formed as a by-product.
    Thus, the correct answer is option C. 

  • Question 3
    1 / -0
    Which of the following is complex V of the ETS of inner mitochondrial membrane?
    Solution
    Complex V of electron transport chain is ATP synthase. The $$F_O$$ component of ATP synthase acts as an ion channel that provides for a proton flux back into the mitochondrial matrix. This reflux releases free energy produced during the generation of the oxidized forms of the electron carriers ($$NAD^+$$ and Q). The free energy is used to drive ATP synthesis, catalyzed by the $$F_1$$ component of the complex.
  • Question 4
    1 / -0
    Hydrogen of malate is accepted by  
    Solution
    The cyclic process through which acetyl co-A is completely oxidized and carbon dioxide is released in a stepwise manner is called Krebs cycle. Oxidation(Dehydrogenation -IV) is one of the steps of Krebs cycle, in which Malate is oxidized by removal of hydrogen and oxalo-acetate gets regenerated. The hydrogen removed in this reaction is taken up by the coenzyme NAD to form NADH$$_2$$. Thus option D is the correct answer.

  • Question 5
    1 / -0
    During Krebs cycle, energy from glucose is mostly transferred to 
    Solution
    The end product of glycolysis is a pyruvic acid which is decarboxylated into acetyl-CoA and enters Kreb cycle where in it is aerobically broken down; the pathway takes place in the mitochondrial matrix. The complete Kreb cycle leads to the net formation of 2 molecules of ATP by substrate-level phosphorylation, 8 molecules of NADH plus 2 molecules of FADH2 (via succinate dehydrogenase). So, most part of glucose energy is transferred to NAD and FAD during Kreb cycle; not to ADP. NADPH is coenzyme of photosynthesis. Photons absorbed by reaction center of PSII drives splitting of water. Thus, the correct answer is option A.
  • Question 6
    1 / -0
    The details of tricarboxylic acid pathway was worked out by
    Solution
    Sir Hans Adolf Krebs was a German born British physician and biochemist. He was the pioneer scientist in study of cellular respiration, a biochemical pathway in cells for production of energy.
  • Question 7
    1 / -0
    How many carbon atoms are present in citric acid?
    Solution
    Citric acid is a weak organic acid with the formula of $$C_6H_8O_7$$. It is a natural preservative, which occurs naturally in citrus fruits. Acetyl-CoA enters the Krebs Cycle when it is joined to oxaloacetate by citrate synthase to produce citric acid. So, it is also the first compound of the Krebs cycle.
  • Question 8
    1 / -0
     Link between glycolysis, Krebs cycle and beta-oxidation of fatty acid is
    Solution
    • The end product of glycolysis, pyruvic acid is converted to acetyl-CoA by the process of oxidative decarboxylation in presence of pyruvate dehydrogenase enzyme. 
    • This acetyl-CoA then enters the Krebs cycle where it is oxidized to produce energy in the form of ATP, NADH and FADH$$_2$$. 
    • Beta-oxidation of fatty acid produces acetyl-CoA which then enters Krebs cycle to produce energy. 
    • Hence, acetyl CoA plays an important link between glycolysis, Krebs cycle, and beta-oxidation process. 

    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    The process by which the energy of glucose is released under aerobic respiration was discovered by
    Solution
    The process by which the energy of glucose is released under aerobic respiration, was discovered by Hans Krebs. The Krebs cycle is a part of cellular respiration. It is a series of chemical reactions used by all aerobic organisms to generate energy.
  • Question 10
    1 / -0
    All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in the cytosol in prokaryotes. This enzyme is 
    Solution

    Correct Option: D
    Explanation:

    • All enzymes of the TCA cycle are present in the mitochondrial matrix except succinate dehydrogenase. 
    • Succinate dehydrogenase is tightly bound to the inner mitochondrial membrane in eukaryotes and to the plasma membrane in prokaryotes.
    • It has three different iron-sulfur clusters and one covalently bound FAD. Before entering ETS in mitochondria, electrons pass from succinate through the FAD and iron-sulfur centres.

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