Question

which example best represents one origin of emerging viral diseases? multiple choice. a virus alters host dna to cause cancer. a virus passes from bats to humans. a virus inserts a prophage into host genome. a filovirus is passed quickly in a community. a sars virus evades the body’s immune system.

Explanation:

Emerging viral diseases often originate from cross - species transmission (zoonosis). Let's analyze each option:

• Option "A virus alters host DNA to cause cancer": This describes how a virus causes cancer, not the origin of an emerging viral disease.
• Option "A virus passes from bats to humans": Zoonotic transmission (from an animal reservoir, like bats, to humans) is a common origin of emerging viral diseases. Many emerging viruses, such as some coronaviruses and filoviruses (like Ebola - related viruses), have jumped from animal hosts (including bats) to humans.
• Option "A virus inserts a prophage into host genome": This is related to the lysogenic cycle of bacteriophages (viruses that infect bacteria), not the origin of emerging viral diseases in humans or other eukaryotic hosts.
• Option "A filovirus is passed quickly in a community": This describes the spread of a virus within a community, not its origin.
• Option "A SARS virus evades the body’s immune system": This describes how the virus interacts with the host's immune system, not the origin of the emerging viral disease.

Answer:

B. A virus passes from bats to humans.