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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Biotechnology (BT)
Which one of the following is considered to be the first biological catalyst when life originated on earth? (a) rna (b) dna (c) protein (d) lipid
Which one of the following is considered to be the first biological catalyst when life originated on earth? (a) RNA (b) DNA (c) Protein (d) Lipid
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Abhijeet Gaurav Best Answer
Answer is (A). RNA has catalytic activity whereas DNA & Lipids don't have. Now talking about earlier conditions when earth was evolving then the environment was very much favorable for the Unstable, Highly Catalytic, Highly mutable elements. RNA is a perfect candidate for these conditions. It has Enzymatic action in Form of Ribozymes, Unstable due to 2' -OH group, Uracil in place of Thymine. So it was originated first before even Protein & DNA. Protein being Biological Catalysts are used now but during earlier reducing conditions it was very difficult for them to be so specific & be doing the catalysis in those extreme conditions.