Provirus differs from prophage in

• A. Integration of copy DNA of a retrovirus with eukaryotic chromosome (DNA)
• B. Integration of RNA with host DNA
• C. Integration of genetic DNA with host DNA
• D. All of the above

Provirus and prophage are terms related to viral genetics, but they refer to different processes and types of viruses.

Key Differences

A provirus is formed when the RNA of a retrovirus integrates into the DNA of a eukaryotic host cell. In contrast, a prophage is the viral DNA that integrates into the bacterial chromosome of a bacteriophage.

Options Explained

• A. Integration of copy DNA of a retrovirus with eukaryotic chromosome (DNA) - This describes a provirus.
• B. Integration of RNA with host DNA - This also refers to a provirus.
• C. Integration of genetic DNA with host DNA - This can refer to both provirus and prophage, depending on the context.
• D. All of the above - This option suggests that all previous statements are correct.

The correct answer is A, as it specifically describes the unique process of provirus formation. While options B and C touch on related concepts, they do not accurately define the distinction between provirus and prophage.