Related words. 1  post verb. 2  post up phrasal verb. 3  post off phrasal verb.  cross-post 1  verb. 1. a public notice, especially one advertising a job Synonyms and related words. Types of advertisement:ad, advert, advertisement...  2. a job that someone is sent somewhere to do, usually in another country Synonyms and related words.
Catalytic RNAs, or ribozymes, are a fossil record of the ancient molecular evolution of life on Earth and still provide the essential core of macromolecule synthesis in all life forms today.
The other answers to this question are all good but there is another way that RNA differs from DNA. As well as being an information carrying molecule RNA can also act as a biological catalyst. A ribozyme is a ribonucleic acid (RNA) enzyme that catalyses a chemical reaction.