Chapter 3 (Enzymes) F.Sc 1st Year Biology Short Questions

Level: F.Sc (Pre-Engg)
Class: 1st Year
Board: Punjab Textbook Board
Subject: Biology
Chapter 3: Enzymes
Type: Short Questions
Author: Kiran Mehtab
Pages: 6
PDF Size: 2 MB

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Life would not be possible without metabolic activities of the cell. This in turn is depends upon the Catalytic molecules called the enzymes. With-out enzymes, the dynamic, steady state of the cell would cease to exist. Life to a complex mesh work involving a perfect co-ordination of a vast majority of chemical reactions. Some of these reactions result in synthesizing large molecules, others in cleaving large molecules and still others either utilize energy or liberate energy. All these reactions would occur very slowly at low temperature and atmospheric pressures, the conditions under which living cells carry on their life proteases. But in the living system these reactions proceed at extremely high rates. This is due to the presence of some specialised substances or Biocatalysts which are synthesized inside the living cells. These biocatalysts are called enzymes (Gr: En = in; zyme = yeast). The term ‘enzyme’ was coined by Friedrich Wilhelm Kuhne (1878). Enzymes may be defined as organic substances capable of catalysing specific chemical reactions in the living system. Just a few years ago, it was considered that all enzymes were proteins. During the 1980s, however, Thomas Cech and Sidney Altman discovered that certain molecules of ribonucleic acid also function as enzymes. These molecules are called ribozymes; which catalyze reactions involved in processing genetic information to be used by a cell. But generally enzymes are proteinaceous in nature.

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