Transformation was discovered by:

1. Meseson and Stahl

2. Hershey and Chase

3. Griffith

4. Waston and crick

The unequivocal proof of DNA as the genetic material came from the studies on:

Semiconservative replication of DNA was first demonstrated in:

1. Drosophila melanogaster

2. Escherichia coli

3. Streptococcus pneumoniae

4. Salmonella typhimurium