AP BIOLOGY

Detailed explanation-1: -RNA world hypothesis was given by Carl Woese, Francis Crick and Leslie Orgel in the 1960s before the discovery of DNA. This hypothesis states that earlier forms of life relied solely on RNA to store genetic information, duplicate itself and to catalyze chemical reactions.

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: -One theory is that RNA, a close relative of DNA, was the first genetic molecule to arise around 4 billion years ago, but in a primitive form that later evolved into the RNA and DNA molecules that we have in life today.

Detailed explanation-4: -The self-replication of RNA nucleotides (monomers) may be considered as the origin of potential self-replication of some extant RNA polymers, and also the reason for homochirality of RNA molecules.

Detailed explanation-5: -So, Most biologists think that RNA was the first genetic material because, the existence of ribozymes suggests that early cells could have used RNA to catalyze chemical reactions and transfer information.