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Respiration in Plants Test - 24

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Respiration in Plants Test - 24
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  • Question 1
    1 / -0
    Connecting link between glycoysis and Krebs cycle is 
    Solution
    Pyruvic acid is produced as the final product of glycolysis. It then gets transformed into acetyl CoA. Acetyl CoA then acts as substrate for the process of Krebs cycle.
  • Question 2
    1 / -0
    Which intermediate compound is involved in the synthesis of amino acids?
    Solution
    • Amino acid synthesis is important for protein synthesis. But not all amino acids are synthesised in the body. Amino acids are mostly formed from the α-ketoacid and later transmitted from the glutamate. So the intermediate compound is α-ketoglutarate acid.
    α-ketoacid + glutamate ⇄ amino acid + α-ketoglutarate
  • Question 3
    1 / -0
    During one Krebs cycle, number of $$CO_{2}$$ molecules released are
    Solution
    The Krebs cycle is a part of cellular respiration. The Krebs cycle comes after link reaction and provides the hydrogen and electrons needed for the electron transport chain. It takes place inside mitochondria. Krebs cycle produces the following:
    • Two molecules of $$CO_2$$  are given off during two decarboxylation reactions.
    • One molecule of $$ATP$$ is formed.
    • Three molecules of $$NADH$$ are produced.
    • One molecule of $$FADH_2$$ is produced.

  • Question 4
    1 / -0
    Complete oxidation of 1 gm of glucose molecule gives rise to 
    Solution
    Complete oxidation of 1 gram of glucose molecule yields 686 kcal, which is equivalent to 686000 calories of energy. Of the 686 kcal, 13 is lost to increase the entropy to break bonds in glucose and the rest energy is used to make ATPs (281 kcal) and rest 392 kcal is released as heat.
  • Question 5
    1 / -0
    In citric acid cycle decarboxylation occurs when 
    Solution
    Citric acid undergoes dehydration to form cis-aconitase which then undergoes hydration reaction to form isocitrate. Isocitrate dehydrogenase enzyme catalyzes oxidative decarboxylation of citric acid into alpha-ketoglutarate. Succinate dehydrogenate catalyzes dehydrogenation of succinate into fumarate which then undergoes hydration reaction to form malic acid. Malic acid is dehydrogenated into oxaloacetate by enzyme malate dehydrogenase. Condensation of oxaloacetate with acetyl-CoA forms a citric acid. So, conversion of citric acid into alpha-ketoglutarate is decarboxylation. Thus, the correct answer is option A. 
  • Question 6
    1 / -0
    Most of the energy in the cell is liberated by oxidation of carbohydrate when 
    Solution
    • Most of the energy in the cell is liberated by the oxidation of carbohydrates when pyruvic acid is converted to $$CO_2$$ and $$H_2O$$. 
    • Pyruvate when enters the Krebs cycle it generates a lot of energy in the form of NADH,  $$FADH_2$$ and GTP, also produces carbon dioxide and water as the by-product through several steps.
  • Question 7
    1 / -0
    In Krebs cycle formation of 
    Solution
    In Kreb's cycle, 
    6 NADH are generated (3 per Acetyl CoA that enters)
    2 FADH$$_2$$ is generated (1 per Acetyl CoA that enters)
    2 ATP are generated (1 per Acetyl CoA that enters)
    4 CO$$_2$$ are released (2 per Acetyl CoA that enters)

    1 NADH= 3 ATP
    1 FADH= 2 ATP
    Thus, 9+ 2+ 1= 12 ATP
  • Question 8
    1 / -0
    The overall goal of glycolysis, Krebs cycle and the electron transport system is the formation of 
    Solution

    Correct Option: A
    Explanation:

    Glycolysis involves the breakdown of glucose into two molecules of pyruvate with the net release of 8 ATP.

    Kerb's cycle takes place in the mitochondria. One molecule of pyruvate generates 15 ATP by undergoing this cycle. So two molecules will lead to the generation of 30 ATP. 
    Electron transport system takes place in the mitochondria where one molecule of NADH$$_2$$ produces three ATP and one molecule of FADH$$_2$$ produces two ATP.
  • Question 9
    1 / -0
    Which of the following observation most strongly support the view that mitochondria contain electron transfer enzymes aggregated into compact association?
    Solution
    Enzymes involved in electron transfer chain ultimately lead to the production of ATP which is the storehouse of energy. On disrupting the mitochondria, the membrane fragments released are capable of synthesising ATP, which shows that the Mitochondria contain electron transfer enzymes aggregated into the compact association. Thus, the correct answer is option C.
  • Question 10
    1 / -0
    In Krebs cycle, the Hydrogen atoms removed at succinate level are accepted by
    Solution
    In Krebs cycle, the hydrogen atoms are removed at succinate level and it gets converted into fumarate. The hydrogen is then accepted by FAD and converted to FADH$$_{2}$$.
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