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Respiration in Plants Test - 9

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Respiration in Plants Test - 9
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  • Question 1
    1 / -0
    The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products.
    Arrows numbered 4, 8 and 12 can all be

    Solution

    Glucose goes through three major pathways - Here, pathway A is glycolysis where 4 ATP are generated. Then the next pathway B is Krebs cycle where 8 ATP are generated after which, the last cycle is oxidative phosphorylation, where 12 ATP are generated.
    Thus, the correct answer is option (B).

  • Question 2
    1 / -0
    The number of substrate level phosphorylations in one turn of citric acid cycle is
    Solution
    During Krebs' or citric acid cycle, succinyl-CoA is acted upon by enzyme succinyl-CoA synthetase to form succinate (a 4C compound). The reaction releases sufficient energy to form ATP (in plants) or GTP (in animals) by substrate-level phosphorylation. Therefore, only one number of substrate-level phosphorylation in one turn of the citric acid cycle.
    So, the correct answer is (A) - one.
  • Question 3
    1 / -0
    Conversion of glucose to glucose-$$6$$-phosphate, the first irreversible reaction of glycolysis, is catalysed by?
    Solution
    Hexokinase catalyses the conversion of Glucose to Glucose-$$6$$-phosphate. It is the first step of activation phase of glycolysis.
    So, the correct answer is 'Hexokinase'
  • Question 4
    1 / -0
    After glycolysis, the fate of glucose in mitochondrial matrix is
    Solution
    After glycolysis, pyruvate forms acetyl Co-A which undergoes oxidation to form $$\displaystyle { CO }_{ 2 }$$ and $$\displaystyle { H }_{ 2 }O$$ through Krebs cycle in mitochondrial matrix.
  • Question 5
    1 / -0
    How many pyruvate produced by oxidation of $$1$$ glucose molecule?
    Solution

    Glycolysis is the cellular metabolic pathway of simple sugar glucose to yield pyruvate and ATP as an energy source.
    Two pyruvate molecules are produced by the oxidation of each one glucose molecule as shown in the above diagram.

  • Question 6
    1 / -0
    Glycolysis is found in cytoplasm of virtually all type of aerobic/anaerobic cells. In the process, glucose is converted into a compound which is 
    Solution
    Glycolysis process takes place in cytoplasm of cell. It is the metabolic pathway the converts glucose to pyruvate. The free energy released in this process are used to form the high-energy compounds ATP and $$NADH_2$$.
  • Question 7
    1 / -0
    ATP formation occurs through which of the following.
    Solution
    • In the process of photosynthesis, the phosphorylation of ADP to form ATP using the energy of sunlight is called photophosphorylation.
    •  Oxidative phosphorylation is the process in which ATP is formed as a result of the transfer of electrons from NADH or$$FADH_2$$ to $$O_ 2$$ by a series of electron carriers. This process, which takes place in mitochondria, is the major source of ATP in aerobic organisms. 
    • Substrate-level phosphorylation is a metabolic reaction that results in the formation of ATP or GTP by the direct transfer of a phosphoryl group to ADP or GDP from another phosphorylated compound.
    •  Hence, ATP formation occurs through Photophosphorylation, Oxidative phosphorylation and Substrate level phosphorylation.
    •  So, the correct answer is 'All of these'

  • Question 8
    1 / -0
    Which of the following reaction needs catalyses by decarboxylase enzyme?
    Solution
    Oxalosuccinate is decarboxylated to form $$\alpha$$-ketoglutarate through the enzyme decarboxylase. It is one of the steps involved in Krebs cycle. It releases one molecule of $$CO_2$$.
    Oxalosuccinate$$\overset{Decarboxylase}{\underset{Mg^{2+}}{\rightarrow}} \alpha$$-ketoglutarate$$+CO_2$$
  • Question 9
    1 / -0
    Krebs cycle takes place in the
    Solution
    Respiration is a catabolic energy release process. Respiration comprises of breakdown of glucose through glycolysis and Krebs cycle and energy production through oxidative phosphorylation. The glycolysis occurs in cytoplasm, Krebs cycle in mitochondrial matrix and oxidative phosphorylation occurs through the electron transport carriers embedded in inner mitochondrial membrane.
  • Question 10
    1 / -0
    Which of the following is widely accepted to respire in absence of oxygen?
    Solution
    Yeast can respire both aerobically as well as anaerobically. Under anaerobic conditions yeast carries out alcoholic fermentation. Thus, it yields carbon dioxide as a product after this process.
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