Question

Evolution was termed "RNA world" due to the discovery of
A. Absence of RNAs in some cells
B. Genomic RNA
C. RNA enzymes
D. Synthesis of proteins by mRNA, tRNA, rRNA

Answer 1

Hint: This hypothesis was projected severally by Carl Woese, Francis Crick and Leslie Orgel in 1960. They were the first to suggest that this molecule could act as a catalyst.

Complete answer:
Evolution was termed "RNA world" due to the discovery of RNA enzymes. Living world’s existence was dependent on enzymes and systems capable of carrying and maintaining the blueprint for these enzymes, and capable of self-replication and transmitting the blueprint generation after generation. Discovery of RNA enzymes, ribozymes, which changed state-specific reactions and at constant time function genetic material light-emitting diodes to the existence of “RNA world”. Per the “RNA world” hypothesis, a self-replicating RNA or a compound with similar chemical characteristics function as the parent of all life on this planet because it had the ability to reproduce itself across generations from the origin of life. Different kinds of RNAs, particularly RNA, rRNA and soluble RNA, did not fulfil each need of serving as a catalyst and genetic material at constant time. Like DNA, RNA could even store genetic info and replicate itself. The self-replicating RNA molecules proliferated even before the invention of deoxyribonucleic acid and proteins. However, some RNA enzymes, called ribozymes, began to accelerate chemical reactions that square measured essential for keeping sustenance. This resulted in the evolution of the RNA world hypothesis.
Hence, the correct answer is option C.

Note: Although ribozymes are quite rare in most cells, their roles are sometimes essential to life. For example, the functional part of the ribosome, the biological machine that translates RNA into proteins, is fundamentally a ribozyme, composed of RNA tertiary structural motifs that are often coordinated to metal ions such as Mg2+ as cofactors.