Question

The phrase" RNA world hypothesis" was coined by
A) Walter Gilbert
B) Kornberg
C) Ochoa
D) None of the above

Answer 1

Hint: RNA world hypothesis states that earth began with simple RNA without any other molecule. Earth's centre of life is DNA, RNA, Protein.

Complete answer:
The first genetic material is to be believed as RNA. It is believed that RNA can behave both as a genetic and catalyst known as ribosome. But also, when protein came into existence a more stable molecule DNA became the dominant genetic material.
DNA is double stranded whereas RNA is single stranded. Now Double stranded DNA uses RNA mainly for building protein from DNA instruction where RNA forms messenger RNA, ribosomal RNA and transfer RNA.
The RNA world hypothesis proposes that RNA was the first life-form on earth, and later by which it became the genetic material of the first prokaryotic cell. This hypothesis is supported by RNA’s ability to duplicate genetic information, store and transmit. Due to its dual characteristic of being able to express as genetic material and enzyme it is believed to be able to have once capable of independent life.
RNA world hypothesis was given by Walter Gilbert in 1986.

So, option A is the correct answer.

Note:
Ochoa discovered how DNA and RNA are formed by which enzymes control this process.
Kornberg discovered DNA polymerase; an enzyme critical to DNA replication.