Linear and circular DNA are two different types of DNA structures. Similarities between linear and circular DNA include:

• Both have a double-stranded helical structure
• Both are compared of Deoxyribose nucleic acids containing adenine, cytosine, guanine, and thymine nucleotides
• Both store genetic information and determine the genetic characteristics of organisms
• Plasmids can occur in both
• Both forms can be amplified using techniques such as PCR (Polymerase Chain Reaction)
• Both can be separated using agarose gel electrophoresis methods
• Both can be used in DNA-based diagnostics and in genetic engineering applications