Question

unit exam - dna and rna
rough strain (nonvirulent)
smooth strain (virulent)
heat - killed smooth strain
rough strain & heat - killed smooth strain
mouse lives
mouse dies
mouse lives
mouse dies
what is transformation?
the process where one viral strain of bacteria is killed using heat
the process where one strain of bacteria is changed by another strain
the process where one strain of bacteria continuously and uncontrollably replicates

Explanation:

To determine the correct definition of transformation, we analyze the options:

1. The first option describes heat - killing bacteria, not transformation.
2. The second option: In the experiment shown (with rough and smooth bacterial strains), when rough (non - virulent) and heat - killed smooth (virulent) strains are combined, the rough strain is changed (becomes virulent) by the smooth strain's genetic material. This matches the concept of transformation, where one bacterial strain is changed by another.
3. The third option describes uncontrolled replication, which is not transformation.

Answer:

the process where one strain of bacteria is changed by another strain