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 Multiple Choice QuestionsMultiple Choice Questions

1.

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

  • Glucose

  • Sucrose

  • Fructose

  • Lactose


B.

Sucrose

Fehling's test is given only by reducing sugars. When Fehling's solution is added to any reducing sugar then a red precipitate is formed which shows that reduction has taken place. Sucrose does not give this test.


2.

The vitamin nicotinamicle can be synthesized in our body from

  • tyrosine

  • tryptophan

  • valine

  • phenylalanine


B.

tryptophan

The amino acid tryptophan serves as a source material for the synthesis of nicotinamide which in turn forms two coenzymes NAD and NADP with metabolic roles.


3.

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.


B.

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

Histamine is a derivative of the amino acid histidine produced by damaged cells of vertebrates. When released, it has the effect of dilating capillaries and lowering blood pressure. Histamine is involved in allergic and inflammatory reactions.


4.

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


A.

Allosteric inhibition of hexokinase by glucose-6-phosphate

Feedback inhibition is a form of enzyme regulation whereby products prevent product formation by binding to an allosteric site and inhibiting enzyme activity.


5.

Kuhne:

  • discovered parathyroid

  • coined the term enzyme

  • coined the term gene

  • discovered enzyme


B.

coined the term enzyme

The term enzyme was given by W. Kuhne in 1678. J.B. Sumner (1926) purified and crystallised urease enzyme and suggested that enzymes are proteins. J.H. Northrop and M. Kunitz (1930) prepared pure crystalline pepsin and trypsin and showed that these enzymes were also proteins.


6.

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

  • Vitamin A

  • Vitamin B

  • Vitamin K

  • Vitamin E


C.

Vitamin K

Vitamin K is essential for normal blood clotting. Its deficiency leads to slow rate of blood clotting, because formation of prothrombin in liver is adversely affected in absence of adequate amount of vitamin K.


7.

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


A.

succinic dehydrogenase by malonic acid

In competitive inhibition, an inhibitor that resembles the normal substrate binds to the enzyme, usually at the active site and prevents the substrate from binding. 

An example of competitive inhibition of an enzyme is the inhibition of succinic dehydrogenase by malonic acid. It is the simple type of competitive inhibition. A competitive inhibitor resembles the substrate and binds to the active site of the enzyme. The substrate is then prevented from binding to the same active site.


8.

A nucleoside is

  • base + sugar

  • base + phosphate

  • sugar+ phosphate

  • base + sugar+ phosphate


A.

base + sugar

Base+ sugar form a nucleoside and base+ sugar + phosphate group combine together to give a nucleotide.


9.

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.


A.

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

Wounds heal slowly due to vitamin deficiency. The best characterized function of vitamin C is the synthesis of collagen connective tissue protein at the level of hydroxylation of prolyl and lysyl residues of procollagen. Thus vitamin C is important for tissue healing.


10.

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

  • Enzymes

  • Nucleic acids

  • Carbohydrates

  • Proteins


D.

Proteins

Out of all the four options, proteins are most essential in the origin of life.