Only one of the two strands of DNA possesses correct hereditary information. It is known as sense strand. Its complementary strand is called antisense strand. Antisense RNA that is made from the DNA strand that means it is complementary to the sense strand of the DNA.

Splicing is the removal of introns and joining the exons in a defined order in a transcription unit. In molecular biology, splicing is a modification of RNA after transcription,in which introns are removed and exons are joined.

A sequential expression of a set of human genes is the DNA sequence. Because gene is the functional part of DNA sequence.

If 30 percent of DNA is adenine, then by Chargaff’s rule 30 percent will be thymine.The remaining 40 percent of the DNA is cytosine and guanine. Since the ratio of cytosine to guanine must be equal, then each accounts for 20 percent of the bases.

Chargaff found that the relative ratios of purine to pyrimidines were equal. Adenine and guanine are purines and cytosine and thymine are pyrimidines;therefore,ratios of adenine and thymine should be equal. Chargaff also found that there is no conserved ratio between specific pairs (e.g., A + T and G + C).

These researchers were able to isolate nearly pure DNA samples. It was only these samples that provided transformation activity.