Question

infect e. coli
remove e. coli
check phage
for tags
what material did hershey and chase prove to be the transformative factor during their experiments?
dna
proteins
viruses

Explanation:

The Hershey - Chase experiment used bacteriophages to infect E. coli. They labeled DNA and proteins of phages. The results showed that DNA (not proteins or just viruses as a whole) entered the bacterial cells and was the transformative factor (the genetic material that carries hereditary information and causes transformation).

Answer:

A. DNA