Q. Semiconservative replication of DNA was first demonstrated in:

A) Escherichia coli
B) Streptococcus pneumoniae
C) Salmonella typhimurium
D) Drosophila melanogaster
Explanation

[Solution from source] Meselson and Stahl (1958) grew E. coli in ¹⁵N and then ¹⁴N medium and showed by CsCl density gradient centrifugation that DNA replicates semiconservatively. Streptococcus pneumoniae was used by Griffith for transformation, not replication. Answer (1).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

Want to attempt the full paper?
View Full Paper Take Full Paper Online