DNA or deoxyribonucleic acid is said ADN or el ácido desoxirribonucleico
Since ácido had an accent on the A you will need to say the a sharply like a-pple, cido is pronounced like si (yes in Spanish) and do and pronounced like dough.
For desoxirribonucleico I would recommend to sound it out by syllable.
De-so-xi-rri-bo-nu-clei-ico
It should sound like-
D(in Spanish)-so-see-rri-bow-new-clay-e-ko