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Respiration in Plants Test - 35

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Respiration in Plants Test - 35
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  • Question 1
    1 / -0
    Succinyl Co-A is related to
    Solution
    Succinyl CoA is an important intermediate of Krebs cycle. It is produced by the action of enzyme alpha-ketoglutarate dehydrogenase on alpha-ketoglutarate. The intermediate succinyl Co-A is acted upon by the enzyme succinyl Co-A synthetase to yield succinic acid. One molecule of GTP is generated due to substrate level phosphorylation during the course of this reaction.
  • Question 2
    1 / -0
    The cell organelle in which aerobic respiration occurs is known as 
    Solution
    The cell organelle in which aerobic respiration occurs is mitochondria. Aerobic respiration includes glycolysis and Krebs cycle. Glycolysis occurs in cytoplasm and Krebs cycle in the mitochondria. 
    Thus, the correct answer is option B.
  • Question 3
    1 / -0
    The first compound of the TCA cycle is
    Solution
    A)       Correct option: (C)
    B)       Explanation for correct option, (C) 

    • TCA cycle is also known as Krebs cycle. TCA cycle stands for the tricarboxylic acid cycle, which signifies that the first stable product is having three carboxylic groups.
    • The first stable product is citric acid, which is a tricarboxylic acid. It is produced by the condensation of one molecule of acetyl CoA and one molecule of oxaloacetic acid.

  • Question 4
    1 / -0
    Most of the energy from the carbohydrates is released by oxidation when
    Solution
    The respiration process can be aerobic or anaerobic. In both the processes glycolysis, which occurs in absence of oxygen is common. Glycolysis converts one molecule of glucose into two molecules of pyruvic acid. In aerobic respiration pyruvic acid is completely metabolised to carbon dioxide and water releasing lot of energy. In anaerobic respiration the pyruvic acid is incompletely metabolised to ethanol or lactate releasing far less amount of energy as compared to aerobic respiration.
  • Question 5
    1 / -0
    Glycolysis takes place in the
    Solution
    The respiration process can be aerobic or anaerobic. In both the processes glycolysis, which occurs in absence of oxygen is common. Glycolysis converts one molecule of glucose into two molecules of pyruvic acid. Glycolysis occurs in cell cytoplasm. 
  • Question 6
    1 / -0
    Fermentation is conducted by
    Solution
    Fermentation is the process of anaerobic respiration, which is carried out by some fungi and bacteria. Fermentation also occurs in muscles of higher vertebrates. In these tissues, it is lactic acid fermentation. Fungi and bacteria carry out alcoholic fermentation (yeast).
  • Question 7
    1 / -0
    The universal hydrogen acceptor is
    Solution
    NAD is the universal hydrogen acceptor, derived from vitamin niacin. NAD works as the coenzyme for a majority of dehydrogenases e.g., pyruvate dehydrogenase. In the dehydrogenation reaction, NAD is reduced to form $$NADH_2$$. The reduced coenzyme form can be oxidised by electron carriers of mitochondrial electron transport system.
  • Question 8
    1 / -0
    Energy obtained by a cell from a catabolic reaction is stored immediately in the form of
    Solution
    Adenosine triphosphate (ATP) is a nucleotide with three phosphates. It is the universal energy currency for all cellular metabolic processes. Endergonic processes are driven by energy input using hydrolysis of ATP. Exergonic processes are coupled to ATP synthesis. The process of ATP synthesis is called phosphorylation because ATP is synthesized by phosphorylation of adenosine diphosphate (ADP) or adenosine monophosphate (AMP). The energy obtained by a cell from catabolic reactions is stored immediately in the form of ATP, as it is the energy currency of the cell.
  • Question 9
    1 / -0
    In respiration, pyruvic acid is
    Solution
    Respiration occurs in two stages. In the first stage called as glycolysis, which occurs in the absence of oxygen, one molecule of hexose glucose is broken down into two molecules of three carbon atom containing pyruvic acid. Each molecule of pyruvic acid is then oxidatively decarboxylated by the enzyme pyruvate dehydrogenase. The pyruvate dehydrogenase releases one molecule of carbon dioxide from each molecule of pyruvic acid during its conversion to Acetyl CoA. The Acetyl CoA is subsequently metabolised in Krebs cycle generating reduced coenzymes.
  • Question 10
    1 / -0
    Iron porphyrin protein complex occurs in the
    Solution
    Cytochromes are iron containing proteins called hemeproteins which are primarily responsible for the generation of ATP via electron transport. It has iron porphyrin protein complex.
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