NSES Content Standard C  
Life Science: The molecular basis of heredity 
Grades 9-12, page 185 

In all organisms, the instructions for specifying the characteristics of the organism are carried in DNA, a large polymer formed from subunits of four kinds (A,G,C, and T). The chemical and structural properties of DNA explain how the genetic information that underlies heredity is both encoded in genes (as a string of molecular "letters") and replicated (by a templating mechanism). Each DNA molecule in a cell forms a single chromosome. 

Benchmark 5B The Living Environment: Heredity
Grades 9-12, page 108
The information passed from parents to offspring is coded in DNA molecules.

Benchmark 5B The Living Environment: Heredity
Grades 9-12, page 109
Genes are segments of DNA molecules. Inserting, deleting, or substituting DNA segments can alter genes. An altered gene may be passed on to every cell that develops from it. The resulting features may help, harm, or have little or no effect on the offspring's success in its environment.

Benchmark 5C The Living Environment: Cells
Grades 9-12, page 114
The genetic information in DNA molecules provides instructions for assembling protein molecules. The code used is virtually the same for all life forms.