Describe the importance of enzymes.

Enzymes are very important as they help decrease the activation energy of an enzyme which would otherwise require very high temperature to occur. The enzymes enable the reactions to take place at body temperature. Without any enzyme the reaction will be very slow thus enzyme is necessary for accelerating the reaction rates. Every reaction be it respiration, photosynthesis etc. requires enzymes

 

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Give two similarities between inorganic catalyst and enzymes.

Two similarities between inorganic catalyst and enzymes are -:

(1) Both are required in small quantities as compared to the substrate.

(2) Both do not change the equilibrium of a reversible reaction.

 

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What role temperature plays in food preservation ?

 Food may be preserved for long in a frozen state because neither microbial enzymes in the food can act at low temperatures to cause its spoilage nor at very high temperatures, as enzymes are denatured. Therefore temperature can play a very important role in preservation. 
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Write a note on cellulose.


Cellulose  is a polymeric polysaccharide consisting of only glucose as a monosaccharide unit. Cellulose is a homopolymer. Cellulose does not contain complex helices. It is present in plant cell wall. Paper and cotton fibre are cellulosic material. 

 

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What is RNA ? Describe its different forms.

RNA or Ribonucleic acid is a type of nucleic acid. It acts as a genetic material incertain viruses. It is composed of ribonucletides which has ribose sugar instead of deoxyribose present in DNA. The nitrogeneous bases present in RNA are adenine, guanine, cytosine and uracil instead of thymine in DNA. 

 

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