Question

Relatively small DNA molecules of plasmids can be identified

• A. Due to similarity to original nuclear DNA molecule
• B. By their restriction fragment patterns
• C. By the size of bacterial cell
• D. By their circular shape

Answer 1

Answer: (B)

By their restriction fragment patterns

• Restriction fragment length polymorphism (RFLP) is a technique used to analyze unique patterns in DNA fragments in order to genetically differentiate between organisms.
• Restriction endonucleases cut the plasmid DNA into short segments. These restriction fragments produced during DNA fragmentation are analyzed using gel electrophoresis.
• Hence the small DNA molecules of plasmids can be identified by their restriction fragment patterns.
  Thus the correct answer is option B.