DNA is fundamental to the biology of all life on Earth, but how many of us actually know what it is or what it's made of?

DNA molecules are composed of four nucleotides, and these nucleotides are linked together much like the words in a sentence. Together, all of the DNA "sentences" within a cell contain the ...

Along with DNA, the other major type of nucleic acid in cells is ... Thes units are called nucleotides, and they are chemically linked to one another in a chain. In DNA, the nucleotides are ...