According to Koch's Postulates, in Order to Prove That Any

question 13

Multiple Choice

According to Koch's postulates, in order to prove that any given infectious agent causes a certain disease a scientist must satisfy all of the following requirements EXCEPT:

• A) the pathogen must be present in every case of the disease.
• B) the same pathogen must be reisolated in the diseased experimental host.
• C) the cultured pathogen must cause the disease when inoculated into a healthy and susceptible experimental host.
• D) the disease is caused by a combination of infectious pathogens and environmental factors.
• E) the pathogen must be cultured and isolated from every case of the disease.

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Definitions:

Stem Cells

Undifferentiated cells with the potential to develop into many different cell types in the body, serving as a repair system for tissues.

Glands

Organs in the body that secrete hormones or other substances directly into the blood or onto a surface within or outside the body.

Neurons

are the basic working units of the brain, specialized cells that transmit information to other nerve cells, muscle, or gland cells.

Sex Hormones

Hormones that regulate the development and functioning of reproductive organs and that stimulate the development of male and female sexual characteristics; they include androgens, estrogens, and progesterone.