When students attempted to duplicate Hershey and Chase’s
experiment, they injected a host cell with radioactive DNA from a
T2 phage and measured radioactivity in the host cell’s descendants.
Why was the students’ experimental design flawed?

1. The DNA should have been labeled with fluorescent dye instead
of radiation.

2. The radioactive DNA should have been incubated before it was
injected in the host cell.

3. The students did not test both components of the phage as
candidates for the heritable material.

4. The students should have taken the DNA from a T4 phage
instead of a T2 phage.