Ribonucleic acid (RNA) is a linear molecule composed of four types of smaller molecules called ribonucleotide bases: adenine (A), cytosine (C), guanine (G), and uracil (U). RNA is often compared ...

Three main types of RNA are involved in protein synthesis: mRNA, tRNA, and rRNA. mRNA is synthesized by the enzyme RNA polymerase. This occurs by using the sequence of bases in a DNA strand to ...

All five nucleobases that make up DNA and RNA have now been detected in meteorite samples, according to a study published yesterday (April 26) in Nature Communications. The work used recently ...