Proteins


 
 
Concept Explanation
 

Proteins

Proteins:

  • Proteins are needed by our body for muscle building and repairing worn out tissues.
  • Our muscles, organs and blood are made up of mostly proteins. Proteins in our diet come from both plants and animals sources.
  • When the body is building new tissues, more proteins are required, so growing children need more protein.
  • Meat, fish, egg and milk are some animal sources of proteins. Pulses, soybeans, grams and nuts are some plant sources of proteins.
  • To test if a food item contains protein of not:

  • Take a small quantity of the food items to be tested. Grind/mash/paste/powder the food item.
  • Put the food item into a test tube.
  • Add 10 drops of water and shake the test tube.
  • Using a dropper add two drops of copper sulphate solution to the test tube.
  • Add 10 drops of caustic soda solution and shake the test tube.
  • Observe the colour of the mixture.
  • Violet colour indicates the presence of proteins in the tested food item. 
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    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    Select the one that is rich in proteins.

    Right Option : B
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    Explanation
    Question : 2

    The total requirement of the proteins for an adult is about __________

    Right Option : B
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    Explanation
    Question : 3

    Given below are the steps to test the presence of protiens in a food item ;

    i) Take a small quantity of fooditem in the test tube, add 10 drops of water to it and shake it.

    ii) Make a paste or powder of food to be tasted.

    iii) Add 10 drops of caustic soda solution to the test tube and shake well.

    iv) Add 2 drops of copper sulphate solution to it.

    Which of the following is the correct sequence of following.

    Right Option : B
    View Explanation
    Explanation
     
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