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  • (a)    Why water soluble vitamins must be supplied regularly in the diet ? Give one example of it. (b)    Differentiate between the following :         (i)&nb

(a)    Why water soluble vitamins must be supplied regularly in the diet ? Give one example of it.
(b)    Differentiate between the following :
        (i)    Essential and non-essential amino acids.
       (ii)    Fibrous and globular proteins.

 

 

 

 
 
 
 
 

Answers (1)

(a)    Water soluble vitamin must be supplied regularly in diest because they are readily excreted in urine and cannot be stored. Example: Vitamin C.

(b)    (i)    Essential amino acids are those which are not synthesized in our body and hence must be supplied in our diet from outside. Example: Lysine.

Non-essential an=mino acids are those which can be made in our bodies and therefore we don't require them in our diet. The human body can synthesize 10 out od 29 amino acids found in proteins. Example: Glycine

       (ii)    Fibrous Proteins - When the polypeptide chains run parallel and held together by H-bonds or disulphide bonds, then fibre the structure is formed. These are insoluble in water. Example: myosin.

Globular Proteins consists of polypeptide chains coiled around each other to form molecules having a nearly spherical shape. These are soluble in water. Example: Insulin.

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Sumit Saini

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