Before Ehrlich Began a Systematic Search for a Chemical to Kill

question 34

Multiple Choice

Before Ehrlich began a systematic search for a chemical to kill specific bacteria,the only chemotherapies available were substances derived from medicinal plants.What distinguished Ehrlich's chemotherapy research

• A)Ehrlich systematically tested hundreds of compounds for their ability to destroy specific bacteria without damaging surrounding tissue.
• B)Ehrlich used metals,such as antimony and mercury to treat diseases.
• C)Ehrlich inoculated his own son with fluid from a cowpox blíster.
• D)Ehrlich introduced cinchona tree bark,a native American remedy to treat malaria.

---

Definitions:

Higher Order Conditioning

A process in behavioral psychology where a conditioned stimulus is paired with a new neutral stimulus, creating a second-level conditioned response.

Conditioned Stimulus

A previously neutral stimulus that, after being paired with an unconditioned stimulus, elicits a conditioned response.

Operant Conditioning

A process of behavioral adjustment where the level of an action is modified through the application of rewards or punishments.

Extinction

In psychology, the gradual weakening and disappearance of a conditioned response tendency.