Question

severe acute respiratory syndrome (sars) is an illness caused by a coronavirus. symptoms include a high fever, headaches, and body aches typically occur two to seven days after infection by the virus. sars is more serious in elderly patients. this information suggests that the reproductive cycle of the sars virus is- lytic, because of the quick onset of symptoms after infection lysogenic, because the virus is a coronavirus lysogenic, because the virus primarily affects older people lytic, because the virus causes respiratory illness

Explanation:

In the lytic cycle, viruses quickly cause symptoms after infection. The SARS virus shows symptoms (high fever, headaches, body aches) 2 - 7 days after infection, which is a relatively quick onset. In the lysogenic cycle, there is a period of dormancy where symptoms may not appear immediately. The fact that symptoms occur soon after infection aligns with the lytic cycle characteristics. The other options are incorrect: just being a coronavirus (option B) doesn't determine the cycle type; affecting older people (option C) is about host - virus interaction in terms of severity, not the cycle type; and causing respiratory illness (option D) is a general characteristic of the virus, not specific to the cycle type.

Answer:

A. lytic, because of the quick onset of symptoms after infection