BIOLOGY IN HUMAN WELFARE
HUMAN HEALTH AND DISEASE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A re-isolated microorganism may evolve into a different species than the original.
|
|
|
The microorganism from the pure culture will cause the disease in at least 80% of healthy organisms.
|
|
|
The microorganism can be isolated and grown in a pure culture.
|
|
|
The disease-causing microorganism must be present in at least half of the cases of disease.
|
Detailed explanation-1: -the answer is The microorganism can be isolated and grown in a pure culture.
Detailed explanation-2: -Koch’s postulates are the following: The microorganism must be found in abundance in all organisms suffering from the disease, but should not be found in healthy organisms. The microorganism must be isolated from a diseased organism and grown in pure culture.
Detailed explanation-3: -Koch’s postulates were formulated in the late nineteenth century as guidelines for establishing that microbes cause specific diseases. Because the rules were developed for living agents-particularly bacteria-their applicability to inanimate pathogens such as viruses and infectious proteins has been problematic.
Detailed explanation-4: -Answer and Explanation: The correct solution to this problem is provided by option B: the microorganism and disease can be identified from a mixed culture.