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 Multiple Choice QuestionsMultiple Choice Questions


Which of these are considered most essential in the origin of life?

  • Enzymes

  • Nucleic acids

  • Carbohydrates

  • Proteins


Assertion : Histamine is involved in allergic and inflammatory reactions.

Reason : Histamine is a vasodilator.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


Which of the following would not give Fehling's test ?

  • Glucose

  • Sucrose

  • Fructose

  • Lactose


A nucleoside is

  • base + sugar

  • base + phosphate

  • sugar+ phosphate

  • base + sugar+ phosphate



  • discovered parathyroid

  • coined the term enzyme

  • coined the term gene

  • discovered enzyme


Assertion : Wounds heal slowly due to vitamin C deficiency.

Reason : Vitamin C is essential for collagen formation

  • If both Assertion and Reason are true and Reason is the correct explantion of Assertion

  • If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If Assertion is false but Reason is true.


Which is a typical example of 'feedback inhibition'?

  • Allosteric inhibition of hexokinase by glucose-6-phosphate

  • Reaction between succinic dehydrogenase and succinic acid

  • Cyanide and cytochrome reaction

  • Sulpha drugs and folic acid synthesizer bacteria


An example of competitive inhibition of an enzyme is the inhibition of:

  • succinic dehydrogenase by malonic acid

  • cytochrome oxidase by cyanide

  • hexokinase by glucose-6-phosphate

  • carbonic anhydrase by carbon dioxide


The vitamin nicotinamicle can be synthesized in our body from

  • tyrosine

  • tryptophan

  • valine

  • phenylalanine


Continuous bleeding from an injured part of body is due to deficiency of :

  • Vitamin A

  • Vitamin B

  • Vitamin K

  • Vitamin E