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Biochemistry Mcqs

Which of the following is NOT a characteristic feature of allosteric enzymes ?

  • (A)  They are multienzyme complex
  • (B)  Follow Michaelis-Menton Kinetics
  • (C)  Presence of Modulator site
  • (D)  Give sigmoid shaped curve
Submitted By :Ali Uppal


Multiienzyme complex in human_______________?

  • (A)  Fatty acid synthetase
  • (B)  Malonyl CoA carboxylase
  • (C)  Carbomoyl Phosphate synthetase
  • (D)  Adenosine phospho ribosyl transferase
Submitted By :Ali Uppal


Key glycolytic enzymes_____________?

  • (A)  Phosphofructokinase
  • (B)  Hexokinase
  • (C)  Pyruvate kinase
  • (D)  Glucose 1,6 diphosphatase
Submitted By :Ali Uppal


Benzidine test is positive with the enzyme______________?

  • (A)  Cytochrome oxidase
  • (B)  Dehydrogenase
  • (C)  Hydrolase
  • (D)  Peroxidase
Submitted By :Ali Uppal


Dehydrogenase used as coenzymes all of the following, except________________?

  • (A)  FMN
  • (B)  FAD
  • (C)  NADP+
  • (D)  Ferro protoporphyrin
Submitted By :Ali Uppal


Which of the following is correct of the pyruvate dehydrogenase enzyme complex ?

  • (A)  It is present in cytoplasm
  • (B)  Catalyzes the conversion of pyruvate to oxaloacetate
  • (C)  Requires TPP as cofactor
  • (D)  Catalyzes a reversible reaction
Submitted By :Ali Uppal


Competitive enzyme inhibition will cause_____________?

  • (A)  Decrease of km and increase of Vmax
  • (B)  increase of km and increase of Vmax
  • (C)  Decrease of km and decrease of Vmax
  • (D)  Increase of km and Unchanged of Vmax
Submitted By :Ali Uppal


The deficiency of thiamine can be identified by measuring the red cell______________?

  • (A)  Transketaolase
  • (B)  Transaldolase
  • (C)  Alpha ketoglutarate dehydrogenase
  • (D)  Pyruvate dehydrogenase
Submitted By :Ali Uppal


The activity of the following enzyme is affected by biotin deficiency____________?

  • (A)  Transketolase
  • (B)  Dehydrogenase
  • (C)  Oxidase
  • (D)  Carboxylase
Submitted By :Ali Uppal


The enzyme that splits hydrogen peroxide into water and oxygen is_____________?

  • (A)  Cytochromes
  • (B)  Cytochrome P 450
  • (C)  Super oxide dismutase
  • (D)  Catalase
Submitted By :Ali Uppal