Biology MCQs Online Quiz Test 13

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Public Service Commission Biology MCQs

Q.1: The active site of an enzyme——-?

  1. Never changes
  2. Forms no chemical bond with substrate
  3. Determined by structure and the specificity of the enzyme
  4. They are non specific in their action


Q.2: Factory of Ribosomal systhesis is—–?

  1. Cytoplasm
  2. Nucleus
  3. Nucleolus
  4. Endoplasmic reticulum


Q.3: If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation——?

  1. Saturation
  2. Denaturation
  3. Composition
  4. Inhibition


Q.4: Who opposed the idea the cell is an empty space bounded by thick wall?

  1. Lorenz Oken
  2. Schwann
  3. Robert Brown
  4. Rudolph Virchow


Q.5: Extreme change in pH results in——-?

  1. Change in ionization of amino acids at the active site of the enzyme
  2. Change in the ionization of the substrate
  3. Denaturation of the enzyme
  4. Increase in the reaction rate


Q.6: Resolution power of a compound microscope is——?

  1. 2.0 m
  2. 2-4 A
  3. 24 m
  4. 24 A


Q.7: Excessive increase in temperature of medium causes the enzyme molecule to——?

  1. Activate
  2. Unaffected
  3. Denatured
  4. None of these


Q.8: If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction———-?

  1. increase in concentration of enzyme
  2. increase in concentration of substrate
  3. increase in pH
  4. increase in temperature


Q.9: In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon——?

  1. Their physical properties like size And weight.
  2. Physical properties of the medium like its density.
  3. Their electrical properties like their charges
  4. Both a and b


Q.10: The structure of an enzyme is altered by——?

  1. Irreversible inhibitor
  2. Reversible inhibitor
  3. Competitive inhibitor
  4. Non-competitive inhibitor