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Biology Test 254

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Biology Test 254
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Sedimentation coefficient of ribosome is measured in

    Solution

    Svedberg unit is used to measure the sedimentation coefficient of ribosome (i.e. how fast a molecule moves in a centrifuge).

     

  • Question 2
    4 / -1

    Newly made proteins are modified by N-linked glycosylation in

    Solution

    Majority of proteins synthesised by the (rough) endoplasmic reticulum undergoes N-linked glycosylation. This process involves the attachment of the sugar molecule (glycan) to a nitrogen atom of a protein.

     

  • Question 3
    4 / -1

    Phragmoplast is precursor of which of the following?

    Solution

    Phragmoplast serves as a scaffold for the assembly of cell plate and subsequent formation of new cell wall (cytokinesis) to separate the daughter cells formed during plant cell division.

     

  • Question 4
    4 / -1

    In which one of the following stages do the chromosomes show minimum coiling?

    Solution

    Chromosomes exhibit minimum condensation or coiling during interphase. It is almost impossible to distinguish them individually during this phase.

     

  • Question 5
    4 / -1

    Which vitamin acts as a coenzyme during the initial steps of fatty acid synthesis?

    Solution

    Biotin is involved in many important metabolic pathways in humans, e.g. fatty acid synthesis, amino acid catabolism, etc.

     

  • Question 6
    4 / -1

    Glutathione peroxidase is an enzyme that catalyses destruction of H2O2. Which of the following elements does it contain?

    Solution

    The enzyme glutathione peroxidase contains selenium (Se). It catalyses certain reactions in order to protect membranes from oxidative destruction.

     

  • Question 7
    4 / -1

    For proper coordination of the body, cell to cell communication is must and it is facilitated by one of the following structures.

    Solution

    Gap junctions allow the exchange of small metabolites, ions, etc., between the adjacent cells. They are a specialised intercellular connection between a multitude of cells through their cytoplasm.

     

     

  • Question 8
    4 / -1

    Major portion of the dry weight of a plant consists of

    Solution

    The major portion of the dry weight of a plant consists of C, H, O. They constitute about 96% of the dry matter.

     

  • Question 9
    4 / -1

    Deficiency of molybdenum leads to

    Solution

    The deficiency of molybdenum leads to the molting and marginal necrosis of leaves. It is a microelement. It is important in the nitrogen metabolism and synthesis of ascorbic acid.

     

  • Question 10
    4 / -1

    Which one of the following hormones can substitute long photoperiods essential for flowering?

    Solution

    Gibberellin can substitute long photoperiods essential for flowering. It can be used in inducing off season flowering in many long day plants as well as plants requiring vernalisation.

     

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