substance prepared from killed or weakened pathogens and introduced into a body to produce immunity
able to cause disease
a change in genotype caused when cells take up foreign genetic material
a virus that infects bacteria
shape of DNA
subunits that make up DNA
A five-carbon sugar found in DNA.
the stucture and size of two nitrogen bases
complementary base pairs
base-pairings result in two strands
the process of making a copy of DNA
open the double helix by breaking the hydrogen bonds that link the complementary nitrogen bases between the two strands.
A Y-shaped region on a replicating DNA molecule where new strands are growing.
enzyme involved in DNA replication that joins individual nucleotides to produce a DNA molecule