EVOLUTION
THE ORIGIN OF LIFE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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RNA in the form of ribozymes may have represented the first life on Earth.
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RNA is an important step in DNA transcription and translation.
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Amino Acids came first, RNA came later.
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RNA was the first protobiont.
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Detailed explanation-1: -The RNA world hypothesis is supported by the observations that ribosomes are ribozymes: the catalytic site is composed of RNA, and proteins hold no major structural role and are of peripheral functional importance. This was confirmed with the deciphering of the 3-dimensional structure of the ribosome in 2001.
Detailed explanation-2: -The RNA world hypothesis suggests that life on Earth began with a simple RNA molecule that could copy itself. The RNA world hypothesis suggests that life on Earth began with a simple RNA molecule that could copy itself without help from other molecules. DNA, RNA, and proteins are central to life on Earth.
Detailed explanation-3: -The RNA world hypothesis suggested that life started with single self-replicating molecules. Among several other hypotheses, autocatalytic sets could have been formed that used initially metals and other small self-produced molecules as catalysts that were able to produce basic blocks first for RNA, then for proteins.
Detailed explanation-4: -The hypothesis that RNA preceded DNA and proteins in evolution. In the earliest cells, pre-RNA molecules would have had combined genetic, structural, and catalytic functions and these functions would have gradually been replaced by RNA.