Ribonucleic acid (RNA)

Ribonucleic acid (RNA) is a biologically important class of molecules containing a long chain of nucleotide units. Each nucleotide consists of nitrogenous base, a ribose sugar and phosphate. RNA is very similar to DNA, but differs in some important details: in the cell RNA is usually single stranded, but DNA double overall stranded, RNA nucleotides contain ribose while DNA contains deoxyribose (type ribose, an oxygen atom missing) and RNA base uracil instead of thymine, is that in the DNA. RNA from DNA by enzymes called RNA polymerases and transcription is usually better prepared for other enzymes. RNA is a central protein synthesis. Here is a kind of RNA called messenger RNA, information from DNA to structures called ribosomes. These ribosomes of ribosomal RNA and proteins that come together to read from molecular machines, and the messenger RNAs that translate the information they contribute to the protein to form. There are many RNAs with other roles - in particular a system which genes are expressed, but also the genomes of viruses