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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
August 24, 2020 • 17:18 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
Sir, how we can justify it.(question in picture)
Which of the following was presented as evidence in favor of "the RNA world" hypothesis ? The fact that DNA can encode genetic information The fact that enzymes, made of protein, can catalyze biological reactions The discovery that some enzymes are composed of RNA rather than protein The discovery of new life forms that encode their genetic information in RNA rather than DNA
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Rahul kumar![best-answer]()
Ribozymes are RNA molecules that accelerate chemical reactions, enzymes that happen to be made of RNA rather than protein. There is no such justification of this statement. These are empirical evidences.
sir, in option 4, wt he is talking about news life forms.. is he talking about past life forms which is now found as fossil or present living beings?
No, genetic materials are normally destroyed in fossils so you can't encode DNA and RNA in fossils. The oldest DNA samples ever recovered are from insects and plants in ice cores in Greenland up to 0.8 million years old. "New life forms" in the option mean existing life on the present day Earth.