Question

when does transformation occur?
a. when an organism receives foreign rna that is transformed into dna
b. when dna is transformed into rna
c. when bacteria are killed with heat
d. when a cell receives foreign dna that is expressed as a new characteristic

Explanation:

Transformation is a genetic process where a cell takes up and expresses foreign genetic material (DNA), resulting in a new heritable trait. Option A describes reverse transcription, not transformation. Option B is transcription, the process of making RNA from DNA. Option C refers to a method used in some transformation protocols but is not the transformation event itself.

Answer:

D. when a cell receives foreign DNA that is expressed as a new characteristic