Assertion :The first molecules formed for replicating cells were most probably RNA. Reason: This was proved by origin of ribozyme in 1987 by T. Cech in Tetrahymena.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The discovery of ribozymes by Thomas Cech of university of Colorado, US showed that RNA is the central participant in the life of cell. He carried out his study on nucleic acid processing and gene expression in a pond living protozoan Tetrahymena thermophila. He noticed that RNA molecule from this organism could be cut into pieces and spliced. It was a most surprising discovery in 1982 as it was only known that only proteins act as catalysts in all biochemical reactions.
Thus, the correct answer is option A.

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