DNA polymerase chooses nucleotides that undergo proper base pairing with the corresponding base on the template strand.
The family of enzymes that catalyze the synthesis of DNA molecules from nucleoside triphosphates, the basic building blocks of DNA, includes DNA polymerase.
These enzymes, which are necessary for DNA replication, often function in groups to split a single original DNA duplex into two identical DNA duplexes.
A primer sequence is introduced with complementary RNA nucleotides to provide this beginning point because DNA polymerase can only add new nucleotides at the end of a backbone.
Later, the primer is taken out, and DNA nucleotides are used in its place.
Yet you can turn up the magnification for an even closer look: Cells contain molecules that aremadeupofevensmallercomponentscalled atoms. Figure 1: Levels of the body from smallest to largest: Atoms, molecules, cells, tissues, organs, and organ systems.
