It is maybe because the alpha helixsecundary structure) characterized by intramolecular hydrogen bonds between amino acid residues and on the other hand, the beta sheet is composed of extended chains with hydrogen bonds between adjacent chains (between residues from two distinct strands).
Many proteins contain both alpha helices and beta sheets, but some contain just one type of secondary structure.
Replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. To accomplish this, each strand of existing DNA acts as a template for replication.
