What do all DNA molecules have in common?

* struktur: They are composed of two long strands of nucleotides twisted into a double helix.

* nukleotider: Hver nukleotid består af et deoxyribosesukker, en phosphatgruppe og en af fire nitrogenholdige baser:adenin (A), guanin (G), cytosin (C) og thymin (T).

* Base pairing: Adenine always pairs with thymine (A-T), and guanine always pairs with cytosine (G-C) through hydrogen bonds. This specific pairing is crucial for maintaining the structure and function of DNA.

* Genetic information: The sequence of nucleotides in a DNA molecule carries genetic information. The order of bases determines the sequence of amino acids in proteins, which ultimately dictate the traits of an organism.

* Replication: DNA can replicate itself, creating identical copies that are passed on to offspring during cell division. This ensures the continuity of genetic information.

Mens alle DNA -molekyler deler disse almindelige træk, kan deres specifikke sekvenser af nukleotider variere enormt, hvilket fører til livets mangfoldighed.