DNA

DNA (Deoxyribonucleic acid) was the nucleic acid that served as the basis for carbon-based life. (TV: School Reunion) It was noted for its double-helix shape, at least in human societies. (TV: Evolution of the Daleks)

Human DNA was made up of a combination of four nitrogenous bases: adenine, thymine, guanine, and cytosine. (AUDIO: Paradise Frost)

The Kinda wore necklaces embossed with a design akin to the double-helix. (TV: Kinda)

In an alternate Paris of 1804, Garce and Eging commented on the idea of the double-helix, finding it ridiculous that two snakes coiled together were inside all humans. (PROSE: The Man in the Velvet Mask)

According to the Eighth Doctor, he had quadruple-helix DNA, but only three out of the four strands were visible to non-temporally aligned scanners (therefore part of his DNA was linked to the Time Vortex). (PROSE: Frontier Worlds)

By placing her hand on the casing of the "Metaltron", the biomass of the human time traveller Rose Tyler was extrapolated and so regenerated the Dalek. However, this had the side-effect of mutating the Dalek, leading to it to self-destruct. (TV: Dalek)

DNA that did not code for a protein was classed as "non-coding". (TV: School Reunion)

DNA bombs attacked their victims by latching on to their DNA. (TV: Kiss Kiss, Bang Bang, The Woman Who Fell to Earth)

River Song's part-Time Lord identity was visible from scanning her DNA as an infant. (TV: A Good Man Goes to War)

Progenitors contained pure Dalek DNA. (TV: Victory of the Daleks)

The Tenth Doctor's Machine That Goes "Ding" lit up in the presence of the DNA of shapeshifters such as Zygons. (TV: The Day of the Doctor)

A sentient cell culture known as the Culture was endangered by an infection of viruses which inserted their DNA into the Culture cells, turning them into nurseries for incubation of more invaders. (COMIC: Culture Shock)

The Department implanted human DNA in CCPCs during experiments. (TV: Mutant Copper) As claimed by Inspector Thorne, Trojan was created from the DNA of every species encountered by the Department, including Jixen, Anubian and Meron. Regarding Trojan's breath, K9 Mark 2 facetiously suggested to Thorne that he may incorporate some "breath mint DNA" next time. (TV: The Eclipse of the Korven)