1st ESO

3rd ESO

4th ESO

Biology 2nd Baccalaureate

Index by courses



Skip navigation

5.3. Ribonucleic acid (RNA)

Ribonucleic acid (RNA)

The ribonucleic acid or RNA comprises nucleotides of ribose, with the nitrogenous bases adenineguaninecytosine and uracil. So it does not have thymine like DNA, except for tRNA. Ribonucleotide binding is via 5'→3' phosphodiester bonds, as in DNA, but RNA is almost always single-stranded.

Although RNA presents a primary structure that is the sequence of ribonucleotides of the chain, it also has folded areas in which hydrogen bonds are established between the complementary bases, AU and GC, originating a certain double-stranded secondary structure of double helix, similar to that of DNA.

RNA is responsible for using the information contained in DNA to carry out protein synthesis.

RNA also has a biocatalytic function, so it is believed that, when life originated, they could be the first molecules capable of self-duplication, although later it would be DNA, with its much more stable chain, that would be in charge of storing the information genetics.

You can find RNA made up of one or two strands:

The RNA is present in many types of viruses and cells prokaryotes and eukaryotes.


Legal warning






Follow us if it has been useful to you

Biology and Geology teaching materials for Compulsory Secondary Education (ESO) and Baccalaureate students.