Scientists Learned That Cell Death Is a Normal and Even

question 10

Multiple Choice

Scientists learned that cell death is a normal and even important part of life by studying the development of the nematode worm C.elegans.What was the most important feature of C.elegans for the study of programmed cell death?

• A)The nematode is smaller and simpler than the fruit fly.
• B)Seventy percent of C.elegans genes have homologs in humans.
• C)The developmental pathway of each cell in the adult worm was known.
• D)Its genome was partially sequenced.

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Definitions:

Spontaneous Recovery

The unexpected return of a learned behavior after its apparent extinction, highlighting the persistence of memory traces.

Conditioned Stimulus

A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, triggers a conditioned response.

Conditioned Response

A learned reaction to a conditioned stimulus that occurs because of previous conditioning.

Extinction

The diminishing of a conditioned response; occurs in classical conditioning when an unconditioned stimulus (US) does not follow a conditioned stimulus (CS).